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The File Format Extensions Encyclopaedia
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A	ADA Program
A	UNIX Library
A01	ARJ Multi-volume Compressed Archive 
A01 - A10	OzWin CompuServe E-mail/Forum Access SYSOP File
A11	AIIM Graphic
A31	Authorware 3.x Library
A3D	Amapi 3D Modeling
A3K	Yamaha A3000 Sampler File
A3L	Authorware 3.x Library
A3M	Unpackaged Authorware MacÊOS File
A3W	Unpackaged Authorware Windows File
A41	Authorware 4.x Library
A4L	Authorware 4.x Library
A4M	Unpackaged Authorware MacÊOS File
A4P	Authorware File Without Runtime
A4W	Unpackaged Authorware Windows File
A51	Authorware 5.x Library
A5L	Authorware 5.x Library
A5W	Unpackaged Authorware Windows File

A8	Cubicomp PictureMaker 24bit 3D Animation
(DOS-based animation program; graphics cards external to computer;
 Cubicomp closed business in 1990)

A86	A86 Assembler Program File
AA	Audio Book File
AAB	Macromedia Authorware Binary
AAC	Advanced Audio Coding File
AAM	Authorware Shocked File
AAS	Authorware Shocked Packet
AB	Applix Builder File
AB$	AutoCAD Spooled Plot File
AB2	Parson's Address Book
AB6	AB Stat Data
AB8	AB Stat Data
ABA	Palm Address Book File
ABC	Flowchart
ABD	Adventure Builder Database
ABD	AmBiz Bonus Calculator Data File
ABF	Adobe Binary Screen Font
ABK	Any Automatic Backup
ABK	Corel Draw AutoBackup
ABL	Maxagrid Avails Data File (text format)
ABM	Album File (various)
ABM	HitPlayer Audio Album File
ABM	Photo Impressions 2000 Album
ABO	Applix Builder Turbo File
ABR	Adobe Photoshop Brush
ABS	Abscissa Data File
ABS	Abstracts
ABS	MPEG Audio Sound File
ABS	PC GNU Compiler Output
ABT	The Arbiter Sports Official Schedule
ABW	AbiWord Document File
ABX	WordPerfect Address Book File
AC	CaseWare Working Papers Client File
AC$	AutoCAD Undo Info
AC_	CaseWare Working Papers Compressed Client File
AC3	AC3 Audio File Format
ACA	MS Agent Character File
ACA	Project Manager Workbench File
ACB	ACBM Graphic Image
ACB	Archived Data File
ACC	DR-DOS Viewmax File
ACD	allCLEAR Flowcharting File
ACD	Chromeleon Channel Raw Data
ACD	MS Agent Character Definiton File
ACD	Sonic Foundry Acid Music File
ACE	The Ace Archiver Compressed File
ACF	Adobe Photoshop Custom Filter
ACF	MS Agent Character File
ACG	MS Agent Preview File
ACH	Rockwell Software Logix 5 File
ACI	ACI Development Appraisal
ACL	ACL for Windows (data mining software)
ACL	Corel Draw 6 Keyboard Accelerator
ACL	MS Office Auto Correction List
ACM	ACBM Image File
ACM	Adobe Photoshop Command Button
ACM	Audio Compression Manager Driver (used by Windows in the system directory)
ACM	Interplay Compressed Sound File
ACO	Adobe Photoshop Color Swatch File
ACP	File Used by Adobe Acrobat Paper Capture
ACP	MS Office Assistant Preview File
ACQ	AcqURL File (bookmark manager)
ACR	American College of Radiology File
ACS	MS Agent Character File
ACT	Action! Presentation
ACT	Adobe Photoshop Color Table
ACT	Documenting Wizard Action Diagram (used by MS Visual FoxProÊ6)
ACT	MS Office Assistant Actor Program File

ACU	AppleLink-PE Compression Format
(created by Floyd Zink; overtaken by Andy Nicholas' ShrinkIt;
 ShrinkIt should unpack)

ACU	COBOL Intermediate Object File
ACV	Adobe Photoshop Saved Curve
ACV	OS/2 drivers that compress and decompress audio data
ACW	MS Accessibility Wizard Settings
AD	After Dark Screen Saver
AD	Ascend Password Protocol File
AD!	OzWin CompuServe E-mail/Forum Access
AD2	2-bit Compressed Voice File
AD3	3-bit Compressed Voice File
ADA	ActiveDocs Answer Set
ADA	ADA Program File
ADB	ADA Package Body
ADB	Appointment database used by HP 100LX organizer
ADC	ActiveDocs Clipping Catalog
ADC	Chromeleon Demo Data File
ADC	Lingvo Dictionary Text File
ADC	Scanstudio 16-color Bitmap Graphic File
ADD	Adobe PageMaker File
ADD	Advantage Database Server Data Dictionary
ADD	OS/2 Adapter Device Driver (used in the boot process)
ADE	ADC Audio File
ADE	MS Access Project Extension
ADF	Adapter Description File
ADF	Administration Configuration File
ADF	Amiga Disk File
ADI	Advantage Data Server Database Index File
ADI	AutoCAD Plotter File
ADJ	LISCAD Plus Adjustment File
ADL	OzWin CompuServe E-mail/Forum Access QS-Special Get Marked
ADL	QEMM MCA Adapter Description Library
ADM	Addict Compiled Dictionary
ADM	Advantage Data Server Database Memo File
ADM	After Dark Screen Saver Module
ADM	Windows Policy Template
ADN	1-2-3 Add-in Utility
ADN	MS Access Blank Project Template
ADO	Adobe Photoshop Duotone Options
ADO	Stata Program
ADP	AOLserver Dynamic Page File
ADP	Astound Dynamite File
ADP	FaxWorks Modem Setup File (for fax modem interaction)
ADP	MS Access Project
ADR	Address Book
ADR	Address Plus Database
ADR	After Dark Random Screen Saver Module
ADR	Smart Address Address Book
ADS	ADA Package Specification
ADT	AdTech Fax File
ADT	Advantage Data Server Database File
ADT	HP NewWave Card Application Data File
ADT	Lingvo Dictionary File
ADV	GUS Virtual Device Driver
ADX	Archetype Designer Document
ADX	Dynazip Active Delivery Script
ADX	Lotus Approach Index File
ADZ	GZ-Packed Amiga Disk File (see ADF)
AE	SoftQuad Author/Editor File
AEH	iPer Advanced Embedded Hypertext
AEP	Adobe After Effects project file
AEP	ArcExplorer Project File
AER	Adobe Atmosphere File
AEU	MS AutoRoute Express Europe Route
AEX	PGP Armored Extracted Public Encryption Key
AF2	ABC Flowchart File (now Micrografx FlowCharter)
AF3	ABC Flowchart File (now Micrografx FlowCharter)
AFC	Apple Sound File
AFC	ArisFlow Commander File
AFD	ArisFlow Diagram
AFD	Prismo Graphics ActiveFile Data
AFF	AnyForm Form
AFI	Truevision Bitmap Graphic
AFL	Lotus Font
AFM	Adobe font metrics
AFM	HP NewWave Cardfile Application
AFM	LOUT File (High-Level Language For Document Formatting)
AFM	Outline Font Metric
AFP	Flowchart Symbol Palette
AFP	IBM Transactional Data Format (Advanced Function Print) (AS400 computer)
AFP	Papyrus Document Storage Format
AFP	Prismo Graphics ActiveFile Proxy
AFS	Filter Factory Photoshop Filter
AFT	AnyForm Template
AFT	Flowchart Template
AFW	Flowchart Work Area
AFX	Auto FX Photographic Edges (Photoshop add-in)
AG	Applix Graphic
AG	Argus Spreadsheet File
AG4	Access G4 File
AGP	Aspen Graphics Pages
AGW	Aspen Graphics Windows
AHQ	AudioHQ Plugin Module
AHS	Adobe Photoshop Halftone Screens
AI	Adobe Illustrator drawing (vector graphic)
AI	Advantage Database Server File
AI	Corel Trace Drawing
AI	Progress Database After Image File
AIF	Audio Interchange File
AIF	Knowledgeware Setup Information
AIF	MacÊOS AIFF sound
AIF	SymbianOS Application Information File
AIFC	Audio Interchange File (similar to AIF)
AIFF	Audio Interchange File (similar to AIF)
AIL	AutoImager File (batch image conversion)
AIM	AOL Instant Messenger File
AIML	Artificial Intelligence Markup Language
AIN	AIN Compressed Archive
AINSO	VAX CRYSTALS Chemical Crystallogaphy File
AIO	APL File Transfer Format
AIP	Audiosoft Parameter File
AIR	Align It! Resource File
AIR	Flight Simulator Aircraft Performance Info File
AIS	ACDSee Image Sequence File
AIS	Array of Intensity Samples (Graphic)
AIS	Velvet Studio Instruments
AIX	HP NewWave Cardfile Application Data
AKF	Acrobat Key File
AKW	RoboHELP Help Project Index File
ALA	Alan Adventure Language File
ALA	Sharp Fax File (unverified)
ALB	JASC Image Commander Album
ALB	Steinberg Cubase or VST Backup Song File
ALBM	HP Photosmart Photo Printing Album
ALBM	webAlbum Photo Album
ALC	dataAlchemy project files
ALC	Norton Internet Security Ad Server File
ALF	Abacus Law File
ALF	ACT! User Logon Tracking
ALF	AdventNet Look and Feel Standards (ALFSTANDARDS.ALF)
ALF	ALF Logic File ("Another logical framework", structure editor for Martin-Lšf's monomorphic type theory)
ALF	Aventail Connect License File (AVENTAIL.ALF)
ALF	Cadence Ambit BuildGates
ALF	LANDesk Client Manager Configuration File
ALF	VPCom Remote User Configuration File
ALI	OM2 OMALI Native OMALI Document
ALI	SAP Proprietary Format Document File
ALL	Always Working Page Format File
ALL	Arts & Letters Library, symbols and characters
ALL	Steinberg Cubase or VST Song File
ALL	WordPerfect Printer Info
ALS	Alias Image
ALS	Calmira Shortcut File
ALT	WordPerfect Menu File
ALV	Adobe Photoshop Levels
ALX	OM2 OMALI Plug-in Extension
ALZ	ALZip Compressed File (Korean site)
AM	Advantage Database Server File
AM	Applix SHELF Macro
AM2	AutoPlay Menu Studio Version 2
AM3	AutoPlay Menu Studio Version 3
AMB	Radiance Ambient File Format
AMC	Ant Movie Catalog
AMF	Advanced Module Format Music File
AMF	DSMIA/Asylum Module Music
AMG	AMG ACTOR System Image
AMG	AMGC Compressed Archive (alternate site)
AMI	Cocreate SolidDesigner Annotation File
AMM	AMM File (pattern design pgm for Universal flat knitting machines)
AMP	Adobe Photoshop Arbitrary Map Settings
AMS	Adobe Photoshop Monitor Setup
AMS	Extreme's Tracker Module Format
AMS	Velvet Studio music module (MOD) file
AMZ	The Amazon Trail Saved Game
AN	Groundworks Text File
ANC	Canon Computer Pattern Maker File
ANI	Animated mouse cursor
ANL	Project Analyzer Saved Analysis
ANM	DeluxPaint Animation
ANN	Annotation to a Windows Help (.HLP) file
ANS	ANSI Graphic
ANS	ANSI Text
ANS	MS Word Text and Layout
ANSR	AnswerTool File
ANT	SimAnt for Windows Saved Game File
AOB	DVD Audio File (MPEG-2 program streams with additional info)
AOF	Acorn Object Format (used for data storage)
AOS	Nokia Add-on Software
AOT	ZenWorks Application Binary Object Template File
AP	Applix Presents File
AP	Datalex EntryPoint 90 Data File
AP	WHAP-Compressed Amiga Archive
APA	AlfaPad Organizer File
APA	ArcPad 6 Applet
APC	Centura Team Developer Compiled Application File
APC	Lotus Printer Driver Characters
APD	Centura Team Developer Dynamic Application Library File
APD	Lotus Printer Driver
APE	Music Format
APF	Acrobat Profile File
APF	ArcPad 5 Profile
APF	Fax2000 File
APF	Homesite Project File
APF	Lotus Printer Driver Fonts
API	1st Reader Passed Parameter File
API	Adobe Photoshop Ink Colors Setup
API	Application Program Interface
API	Application Program Interface file; used by Adobe Acrobat
API	Lotus Printer Driver Info
APJ	Angel Debug Monitor Project File (link is PDF file)
APJ	ARM Project Manager File
APJ	Music Screen Saver File (usually associated with .SCR file)
APK	GameSpy Arcade Service
APL	APL Workspace File
APL	ArcPad 6 Layer
APL	Centura Team Developer Application Library File
APM	ArcPad 6 File
APO	Apollo Scripts
APP	ArcPad 5 Project
APP	Centura Team Developer Normal Mode Application File
APP	CLARION for Windows Application
APP	dBASE Application Object File
APP	Executable Application (under DR-DOS, NeXTstep, Atari, SymbianOS)
APP	Generated application or Active Document (used by MS Visual FoxProÊ6, R:Base, Symphony)
APR	ArcView Project File
APR	Employee Appraiser Performance Review File
APR	Lotus Approach 97 File
APS	Advanced Patching Systems with Error Checking
APS	ArcPad 5 Symbology File
APS	MS Visual C++ File
APT	Centura Team Developer Text Mode Application File
APT	Lotus Approach Data View File
APT	Nimbus 7 SAMS Data File (a-priori temperature profiles)
APX	ArcPad 6 XML File
APX	Borland C++ Appexpert Database
APX	Lotus Approach Paradox-specific Information File
AQ	Applix Data
AR	Compressed Archive File (used by MS Midtown Madness 1 & 2 games, City Add-on)
ARC	Archive File
ARC	LH ARC (old version) compressed archive
ARF	Automatic Response File
ARH	ArHymo Hydrologic Simulation
ARI	Aristotle Audio File
ARI	Compressed Archive
ARJ	Compressed Archive
ARK	Compressed Archive
ARL	AOL Organizer File
ARM	Armadillo Software Protection System
ARQ	Compressed Archive (often on a MacÊOS machine)
ARR	Atari Cubase Arrangement
ART	Another Ray Tracer Format
ART	AOL Johnson-Grace Compressed File
ART	Blood Archive
ART	Canon Crayola Art File
ART	Clip Art File
ART	Duke Nukem 3D Archive
ART	First Publisher Raster Graphic
ART	Xara Studio Drawing
ARV	Arsiv File
ARX	Compressed Archive
ARY	Compaq SmartStart Scripting Toolkit File
AS	Applix Spreadsheet
AS	Macromedia Flash Action Script (include files when writing large scripts)
AS4	AS/400 Client Access
ASA	Active Server Document
ASA	MS Visual InterDev File
ASC	ASCII Text File
ASC	Indian Languages Document (iLeap)
ASC	PGP Armored Encrypted File, used by PGP (see www.pgpi.org)
ASD	Astound Presentation
ASD	Lotus Screen Driver
ASD	MS Advanced Streaming Format Description File
ASD	MS Word Automatic Backup (auto save)
ASE	Velvet Studio Sample
ASF	APL*Plus/PC APL Shared File
ASF	Electronic Arts Music File
ASF	Lotus Screen Font
ASF	MS Active Streaming (Media) File (contains audio and/or video compressed with 3rd party codecs)
ASF	Statgraphics Data
ASH	TASM Assembler Header
ASI	Borland Assembler Include
ASK	askSam Database
ASM	Assembler Source Language (various)
ASM	Pro/Engineer Assembly file
ASMX	ASP.NET Webservices Source File
ASO	Assembler Object
ASO	Astound Dynamite Objects
ASP	Active Server Page (an HTML file containing a MS server-processed script)
ASP	Adobe Photoshop Photo File Index/Separation Setup
ASP	Astound Presentation File
ASP	EROSION 3D Aspect File
ASP	Procomm Plus ASPECT Program (setup and connection script)
ASPI	Audio Catalyst
ASPX	ASP.NET Source File
ASR	Adobe Photoshop Scratch Area
ASR	MS Automap Route
AST	Adobe Photoshop Separation Tables
AST	Astound Multimedia File
AST	Claris Works Assistant File
ASV	Adobe Photoshop Selective Color
ASV	DataCAD Autosave File
ASX	Cheyenne Backup Script
ASX	Metafile (points to an .ASF structured file)
ASX	MS Advanced Streaming Redirector file
ASX	Video File
AT2	Aldus Persuasion 2.0 Auto Template
ATF	Adobe Photoshop Transfer Function
ATL	Hal/Supernova/Lunar/LunarPlus Screen Readers/Magnifiers
ATM	Adobe Type Manager Data File
ATN	Adobe Photoshop Action File
ATO	Just Burn File (audio CD burner on Compaq computers)
ATR	Lightscape Material Library
ATT	ASCII Translation Table (-> ASCIIMEX.CXT)
ATT	AT&T Group 4 Bitmap (fax)
ATW	AnyTime Deluxe PIM File
AU	Music File (various, usually Sun or UNIX)
AUD	Audio File used by Westwood Studios for various games
AUP	ePocrates File
AUS	Calamus-module/-driver Ausschie§schema = Imposition page grouping scheme (-> IMPOS_LT module)
AUT	Authentication File (various)
AUT	AutoIt Script (automate any windows based task)
AUT	Descent Manager Mission File
AUT	GPSMan-autoMapic File (moving-map real-time plotting)
AUT	Interactive Pictures iPIX Format
AUT	PocketWear Car Lease Kit Vehicle Data File (Pocket PC)
AUT	Signwave Auto-Illustrator File
AUT	TLG Workplace CD Search File
AUT	Xitami Webserver Admin Password File (default.aut)
AUX	ChiWriter Auxilliary Dictionary File
AUX	TeX/LaTeX Auxilliary Reference File
AV	Final Draft AV Document File
AVA	Avagio Publication
AVB	Inoculan Anti-Virus Virus Infected File
AVB	MS Chat Character File
AVD	Avery Label Pro Data File
AVI	Audio Video Interleave File
AVI	MS Video for Windows video clip
AVR	Audio Visual Research Sound File
AVS	Animation File
AVS	Application Visualization System Format
AVS	Stardent AVS-X Image
AVS	Winamp Advanced Visualization Studio File
AVX	ArcView File
AW	Applix Word File
AW	HP AdvanceWrite Text File
AWB	Lavasoft Ad-aware Backup File
AWD	Award BIOS File
AWD	AWK Language Source Code File
AWD	FaxViewer Document (AWD MS Fax)
AWE	Adobe Acrobat Bookmark XML File
AWF	Qui veut gagner des millions Archive
AWF	Who wants to be a millionaire Archive
AWK	AWK Script
AWM	Animation Works Movie
AWR	Telsis Digital Audio File
AWS	Fax signature viewer
AWS	StatGraphics Data File
AWX	MS DirectX 8.1
AX	DirectShow Filter
AXD	Avery Label Pro Re-Index File
AXE	ChordMaster (Chord Chemistry and Sequencing program for guitarists)
AXE	MS Autoroute Export File
AXE	Paradigm C++ Integrated Debugger File
AXG	MS Autoroute Trip File
AXL	ArcIMS XML Project File
AXR	Telsis Digital Audio File
AXS	MindAvenue AXEL Stream File
AXT	Adobe Photoshop Replace Color/Color Range
AXT	ZenWorks snAPPshot ASCII Application Object Template
AZ	WinDVD File
AZZ	AZZ Cardfile Personal Information Manager

B	Applause Batch List
B	Befunge Program
B	Brainf*ck Program (small programming language)
B	Limbo Implementation File (Inferno OS)
B&W	1st Reader Mono Binary Screen Image
B&W	Atari Bland and White Graphics
B_W	1st Reader Mono Binary Screen Image
B_W	Atari/MacÊOS Black and White Graphic
B02	ADP Payroll
B1J	BookJones
B1N	1st Reader Binary Screen Image
B1S	BookSmith
B30	Ventura Publisher Printer Font
B3D	3D Builder File
B3D	BDE Multipath Movie Digital Viewer
B4	Helix Nuts and Bolts File (Helix Software now part of McAfee)
B64	Base 64 MIME-encoded File
B8	Piclab Raw Graphic File
BAC	Backup File
BAD	Brutus Application Definition File (password cracking)
BAD	Oracle BAD File
BAD	Rime Mailer Address File
BAG	AOL Instant Messenger File
BAG	Emperor: Battle for Dune Archive
BAG	OS/2 Netfinity Manager Sysinfo File (adapter.bag)
BAG	PMMail Mail Index File
BAK	Backup File
BAL	Ballade Music Score
BAN	Sierra Print Artist Banner
BAR	dBase Application Generator Horizontal Menu Object
BAS	BASIC Language Source
BAS	Basic Module
BAT	Batch Processing (DOS Batch File)
BB	Blitz Basic File
BB	Papyrus Database Backup
BB	Starfleet Battles DOS Game
BB2	XBBS-OS/2, XGROUP, AV and ZTree Archiver Control File
BBL	TeX/BibTeX Bibliographic Reference File
BBM	Deluxe Paint Image File
BBMA	Bonzibuddy
BBP	BitBeamer Split File (of the form .??_??.bbp)
BBS	Bulletin Board Sytem Text
BC	Sierra Print Artist Business Card
BCC	Calendar Creator 8 Collection
BCF	ConfigSafe Snapshot Index
BCF	The Sims (Maxis) 3D Body Mesh File
BCH	Datalex EntryPoint 90 Data File
BCH	dBase Application Generator Batch Process Object
BCH	Phoenix Software (Datalex) Entry Point 90 Data File
BCK	Backup
BCM	MS Works Communications File
BCN	Business Card Pro Design
BCO	Bitstream Fontware File
BCP	Borland C++ Makefile
BCW	Borland C++ 4.5 Environment Settings
BDB	MS Works Dababase File
BDE	Borland Database Engine (embedded in many different programs)
BDF	Backup To CD-RW Backup Definition File
BDF	Egret Data File
BDF	West Point Bridge Designer File
BDF	X11 Bitmap Distribution Format
BDG	Badge Designer 2000 Photo ID
BDR	MS Publisher Border
BEC	Break Even Calculator
BEZ	Bitstream Fontware File
BF	Befunge Program
BF	Brainf*ck Program (small programming language)
BF2	Bradford 2 Font
BFA	Blowfish-encrypted File
BFC	Briefcase File
BFC	Windows 95 Briefcase document
BFF	AIX Backup File Format
BFFM	B17 Flying Fortress Game File
BFL	Colin McRae Rally 2 Data File
BFM	UNIX Font Metrics File
BFX	BitFax Document
BG	MS Backgammon for Windows Game
BGA	OS/2 Graphic Array
BGB	MS Chat Background Graphic
BGI	Borland Graphic Interface
BGL	Flight Simulator Scenery File
BH	PowerArchiver Compressed File
BHF	pcAnywhere Host File
BHTML	BabuHTML Embedded Software File (example use: netMailshar)
BHX	Archive File
BI	Binary Data File
BI	Progress Database Before Image File
BIB	Bibliography
BIB	Papyrus Database
BIB	TeX/BibTeX Literature Database
BIC	Civilization III Scenario
BID	BidMaker 2002 File
BIF	Baldur's Gate Archive
BIF	GroupWise Initialization File
BIF	Image Capture Board Binary Black & White Image
BIF	Planescape: Torment Archive
BIG	Chinese (old version)
BIK	Bink Game Video File
BIK	BioCharter Profile Backup File
BIN	Binary Data File
BIO	BioCharter Profile File
BIO	OS/2 Bios File
BIT	Bitmap Image
BIT	Worms World Party/Armageddon Imported Map
BIZ	Broderbund Print Shop Business Card File
BJF	NTI Backup NOW! File
BK	Backup
BK	JetFax Faxbook File
BK	LinguAssist File
BK	Sometimes used to denote backup versions
BK!	Backup
BK$	Backup
BK$	Sometimes used to denote backup versions
BK?	Backup (Can be 1 to 9, usually with WordPerfect)
BKF	Moto Racer Archive
BKG	Background File (used in many games/programs)
BKG	UWXAFS Binary Format Data File (absorption data on an energy grid which does not need to be evenly spaced)
BKI	Backup Index
BKP	Backup
BKS	An IBM BookManager Read bookshelf
BKS	Bookshelf Backup
BKS	IBM BookManager Read Bookshelf
BKS	MS Works Spreadsheet Backup
BKU	Timeslips Backup
BKW	FontEdit Fontset Mirror Image
BLA	Blat E-mail (command line E-mail tool written for Windows)
BLB	DreamWorks Resource Archive
BLD	BASIC Bload Graphics
BLD	VersaPro Block Build Info
BLEND	Blender 3D File
BLG	Windows Binary Performance Log (W-2000 & W-XP have different formats)
BLK	Alias Wavefront Image
BLK	Lightscape Block Library
BLK	VersaPro Block
BLK	WordPerfect Temp File
BLL	An extension used by the VBS/European-A worm.
BLT	Saved AIM Buddy List File
BLT	Wordperfect for DOS File
BM	Bitmap Graphic
BM1	Apogee BioMenace Data File
BMF	Image File
BMI	Blue Martini Import File (eCRM)
BMI	Buzz Instrument
BMK	An A bookmark file
BMK	Help Bookmark
BMP	Windows or OS/2 Bitmap Graphics
BMS	Backup Magic Backup Set
BMW	Buzz Music File with Waves
BMX	Buzz Music File
BMZ	Demon Stalkers: Raid on Doomfane (old game)
BN	AdLib Instrument Bank
BNK	Adlib Instrument Bank
BNK	Bink Compressed Video/Audio File
BNK	SimCity Game File
BNR	Binary News Reader File
BNSKIN	Beatnik Clock Skin
BOB	BobDown Downloading Program
BOL	MS Booasm Compressed Archive Library
BOM	Orcad Schematic Capture Bill of Materials File
BOM	Softshare Delta Business Object Model
BOO	Book
BOO	Compressed Archive File
BOO	Image File
BOOK	Adobe FrameMaker Book File
BOS	Brotherhood of Steel Compressed File (renamed ZIP file; use any extractor)
BOT	Frogbot Editor (Frog = Quake add-on computer opponent)
BOX	Lemmings Revolution Archive
BOX	Notes Mailbox
BOX	ThrottleBox Multimedia Viewer
BPC	BuildPro File
BPC	Business Plan Toolkit Chart
BPL	Delphi Library
BPS	Bulletproof FTP Settings
BPS	MS Works Document
BPT	Bitmap Master File
BPX	Truevision Targa Bitmap
BQY	BrioQuery File
BR	Bridge Script
BR	The Playa File (link is tentative)
BR3	Bryce 3D Scene File (Bryce made by MetaCreations, changed to Viewpoint, product taken over by Corel)
BR4	Bryce 4 File (Bryce made by MetaCreations, changed to Viewpoint, product taken over by Corel)
BRC	Bryce 2 Scene File (Bryce made by MetaCreations, changed to Viewpoint, product taken over by Corel)
BRD	EAGLE Board File
BRI	Basic Rate Interface File
BRK	Brooktrout Fax-Mail File
BRO	Tree Professional Broadleaf Creator File
BRP	Tree Professional Broadleaf Creator Image
BRS	Corel Paint Classic File
BRU	Brutus Restore File (password cracking)
BRW	Application file associated with financial institution(s) loan applications
BRX	A file for browsing an index of multimedia options (pictures, sound, text, videos) on a CD-ROM
BRX	Multimedia Browsing Index
BRZ	DbBRZ File (Backup or Restore)
BS_	MS Bookshelf Find Menu Shell Extension
BS1	Apogee Blake Stone Data File
BS2	Basic Stamp 2 Code File (WordPad or BS2-Editor)
BSA	BSARC Compressed Archive
BSB	MapInfo Sea Chart
BSB	SWAT Sub-basin Output File (river basin scale model)
BSC	Apple II Compressed Archive
BSC	Boyan Script
BSC	Fortran Pwbrmake Object
BSC	MS Developer Studio Browser File
BSC	Source Browser Database
BSK	Bryce 4 File
BSP	Half-life/TFC/CS Map
BSP	Quake Map
BST	BibTeX Style File
BSV	BASIC Bsave Graphics
BTM	4DOS Batch To Memory Batch File
BTM	Batch file used by Norton Utilities
BTN	ButtonWare File
BTO	Baytex Organix! 2001 Language Kit
BTR	Btrieve Database File
BTR	MS Frontpage-related File
BUD	Quicken Backup
BUF	WinXL File (Datascope emulation software)
BUG	Bug (Problem) File
BUL	Holiday Lights Screen Saver Bulb File
BUN	CakeWalk Audio Bundle File (a MIDI program)
BUP	Backup DVD Info File
BUP	Brother Embroidery System File
BUP	CD Indexer
BUP	PC-Bibliothek Update File
BUP	Softcode Tracker Contact Manager Backup (Australian software no longer sold)
BUT	Buttons! Button Definition
BUY	Movie Data File
BV?	WordPerfect Overflow File (Can be 1 to 9)
BVS	BVS Solitaire Collection
BW	SGI Black and White Image
BW	Silicon Graphics Raw RGB File
BWB	Visual Baler Spreadsheet File
BWI	Blindread/Blindwrite
BWR	Kermit Beware Bug List
BWS	Blindread/Blindwrite
BWT	Blindread/Blindwrite
BWV	Business Wave File
BXF	Man's Best Friend Software Breeder Exchange Format
BYU	Movie File (Shockwave)
BZ	Bzip UNIX Compressed File
BZ2	Bzip UNIX Compressed File (Replaces .BZ)
C	C Code/Program File
C	Check Point Site Configuration for Secure Remote
C	Desktop Color Separation Specification Cyan Layer (usually an EPS file)
C	UNIX Compact File Achive
C--	Sphinx C-- Source Code
C??	Winace Compressed File
C++	C++ Source Code
C00	Ventura Print File
C01	Typhoon Wave File
C08	Lord Of Destruction Game File (unverified)
C2D	CeQuadrat WinOnCD Image file (AKA ISO)
C2D	IsoBuster File
C2D	WinOnCd CD Image
C3D	Chem3D Chemical File
C3T	Chem3D Chemical Template File
C4	JEDMICS (Joint Engineering Data Management) DoD Engineering Data Format
C4D	Cinema 4D (3D Modeling texturing and animation program)
C6	Ashlar-Vellum File
C86	C86 C Program
CA	DATAIR FlexPlus Data File
CA	Telnet Server Initial Cache Data File
CA1	OzWin CompuServe E-mail/Forum Access Catalog File
CA4	Electronics Workbench Circuit
CA7	Beta 44 Job File
CAB	Install Shield v5.x or 6.x Compressed File (not compatible with MS .CAB files)
CAB	MS Cabinet File (program files compressed for software distribution)
CAC	dBase IV Executable File
CAD	Softdesk Drafix CAD File
CAF	Southern Company Terrestrial Data Acq
CAG	MS Clip Gallery Catalog File
CAL	Calendar Schedule Data File
CAL	CALS Compressed Bitmap
CAL	DOS Calendar Creator File
CAL	Radiance Function File Format
CAL	SuperCalc Worksheet
CAM	Casio Camera Graphic
CAN	Navigator Fax
CAP	Compressed Music File
CAP	Network Associates Sniffer Capture File
CAP	Telix Session Capture
CAP	Ventura Caption
CAR	AtHome Assistant File
CAR	Carrara Environment
CAS	Comm008-FileFormats-a.aspelimited ASCII File
CAS	i2's Case Notebook Timeline Analysis
CAT	dBase Catalog
CAT	INSITU Library (catalog) File containing 2-D and 3-D objects
    (CAT = French software for office and kitchen planning)
CAT	OzWin CompuServe E-mail/Forum Access Catalog File
CAT	Quicken IntelliCharge Categorization File
CAZ	Computer Associates Archive
CB	MS Clean Boot File
CBC	CubiCalc Fuzzy Logic System File
CBI	IBM Mainframe Column Binary Formatted File
CBL	COBOL Program
CBM	XLib Compiled Bitmap
CBT	Computer Based Training
CC	C++ Program File
CC	dB2K Custom Class File
CC	Picture Window's Color Curve File (ASCII text file)
CC	Visual dBASE Custom Class File
CC1	Chem3D Cartesian Coordinates 1
CC2	Chem3D Cartesian Coordinates 2
CC5	Calendar Creator 5.x 6.x File
CCA	CC:Mail Archive File
CCA	Multimedia Fusion File (multimedia game creation)
CCB	Visual Basic Animated Button Configuration
CCC	Chat
CCC	Curtain Call Native Bitmap Graphic
CCD	CloneCd Related File
CCD	Vector CAD Program File
CCE	Calendar Creator 2 Event File
CCF	AudioReQuest Control File
CCF	Multimedia Viewer configuration file used in OS/2
CCF	OS/2 Multimedia Viewer Configuration File
CCF	Remote Control File (various to include: ProtoProEdit, RAVedit)
CCF	Symphony Communications Configuration File
CCH	Corel Chart
CCH	Fabasoft Components
CCL	Intalk Communication Command Language
CCM	Lotus CC:Mail Mailbox
CCN	Vitalize! Game File (Played via IE plug-in)
CCO	CyberChat Data File
CCO	XBTX BTX Graphics File
CCP	C Converter Profiles (construction site management)
CCR	Chat Room Shortcut
CCS	CONKY CeZaR Stribas International
CCT	Logic Works Schematic File
CCT	Macromedia Director Shockwave Cast
CCT	SIL Hebrew Font System Transliteration Table
CD	cdTree Content List
CD1	DATAIR Cafeteria Document System Data File
CD2	DATAIR Cafeteria Document System Custom Text File
CDA	CD Audio Track
CDB	CardScan Database
CDB	Clipboard File
CDB	Nokia 9210/9290 Contact Database
CDB	One Page from a ROM With a View Project File
CDB	PowerDesigner Conceptual Model Backup File
CDB	SymbianOS Contact Database File
CDB	Turbo C Database
CDC	Chromeleon Driver Configuration Plugin
CDD	Chromeleon Device Driver
CDD	Claris Draw v 1.2 Document
CDE	Honeywell Hybrid Control Designer (HC900-x Industrial Controllers)
CDF	Comma Delimited Format
CDF	Cyberspace Description Format
CDF	InstallShield Components Definition File
CDF	MS Channel Definition Format File
CDF	NetCDF Graphic File
CDG	DART Karaoke Studio CD+G File (contains only song lyrics and synchronization data)
CDI	Disc Juggler File (CD-ROM data)
CDI	Philips Compact Disk Interactive Format
CDJ	Disc Juggler File (CD-ROM data)
CDK	Atari Calamus Document
CDL	CaseWare Working Papers Document Link
CDL	SignLab Vector Graphic
CDM	PowerDesigner Conceptual Model File
CDM	Visual dBASE Custom Data Module
CDP	CD/Spectrum Pro
CDR	Corel Draw Drawing (vector graphic)
CDR	Raw Audio-CD Data
CDR	Sound File
CDS	ChemDraw Stationery Document
CDT	Atari Calamus Druckertreiber = Calamus printer driver
CDT	Corel Draw Template
CDX	Active Server Document
CDX	ChemDraw Chemical Structure
CDX	Compound Index
CDX	Compound index (used by MS Visual FoxProÊ6)
CDX	Corel Draw Compressed Drawing
CDX	Microstation Cell Library Index
CDX	MS Visual Foxpro Index
CDXL	Old Amiga Movie Format
CDXML	ChemDraw XML ChemDraw Format
CDZ	ROM With a View Project File
CE	FarSide Computer Calendar File
CE3	Calendar Creator 3.x 4.x Event List
CEF	Compact Embedded Font
CEG	Continuous Edge Graphic
CEG	Tempra Show Bitmap Graphic
CEL	Autodesk Animator Graphic
CEL	CIMFast Event Language File
CEL	Kiss Paper Doll File
CEL	Microstation Cell Library
CEM	Empire Earth Game File
CEN	Master Tracker Financial Analysis
CER	Atari Calamus Exporttreiber Rastergraphik = Calamus raster-graphics export driver
CER	Certificate File (MIME x-x509-ca-cert)
CER	Sierra Print Artist Certificate
CET	Atari Calamus Exporttreiber Text = Calamus text export driver
CEV	Atari Calamus Exporttreiber Vektorgraphik = Calamus vector-graphics export driver
CEV	LOUT Character Encoding File (High-Level Language For Document Formatting)
CEV	Software License Tracking Tool (CERTAUTH.CEV)
CEX	INMOS Transputer Development System Occam User Program
CEX	The Currency Exchanger Rate File
CF	Imake Configuration File
CF4	Catfish File Manager Support File
CFB	Comptons Multimedia File
CFF	Capabilities File for FOUNDATION(tm) Fieldbus H1 (31.25 kbit/s)
CFG	Configuration File (various)
CFH	Capabilities File for FOUNDATION(tm) Fieldbus HSE (100 Mbit/s)
CFL	Corel Flowchart File
CFM	Cold Fusion Template File
CFM	Corel FontMaster
CFM	Visual dBASE Windows Customer Form
CFN	Atari Calamus Font Data File
CFO	TCU Turbo C Utilities C Form Object
CFP	Complete Fax Portable Fax File
CFR	IBM Configurator Report (if you don't have the program ask the sender to export to .RTF for you)
CFT	Atari Calamus Farbtabelle = Calamus colour table
CFW	ChemFinder Form
CGA	Ventura CGA Screen Characters
CGI	Common Gateway Interface Script File
CGM	Computer Graphics Metafile
CGP	NetCaptor CaptorGroup
CH	Clipper Header
CH	OS/2 Configuration File
CH3	Harvard Chart (Harvard Graphics taken over by Serif)
CH4	Charisma 4.0 Presentation
CHA	Adobe PageMaker Kerning Data
CHD	FontChameleon Font Descriptor
CHF	pcAnywhere Remote Control File
CHI	Chiwriter Document
CHI	Help File Index (typically used when the Help file will stay on a CD-ROM - .CHI speeds access to the info)
CHJ	Help Composer Project
CHK	CHKDSK/SCANDISK Output
CHK	File fragments saved by Windows Disk Defragmenter or ScanDisk
CHK	WordPerfect Temp File
CHL	Chromeleon Channel Raw Data
CHL	Configuration History Log
CHM	ChemDraw Chemical Structure (old format)
CHM	Compiled HTML (Help) File (need specialized viewers for these files)
CHN	Ethnograph Data File
CHP	Atari Calamus Hyphenations
CHP	Ventura Publisher Chapter
CHQ	Help Combined Full-text Search File (produced when multiple .CHM files are merged)
CHR	Character or Font File
CHRT	KChart File (KOffice format)
CHT	Atari Calamus Hyphenation Table = User- defined hyphenation points)
CHT	ChartViewer dBase Interface File
CHT	Cheat Machine Data File
CHT	Harvard Graphics Vector File (Harvard Graphics taken over by Serif)
CIF	Atari Calamus Importtreiber Font = Calamus font import driver
CIF	CalTech Intermediate Graphic
CIF	Chip Layout Information
CIF	Colombo Ipermedia File
CIF	Easy CD Creator Image
CIF	pcAnywhere Caller File
CIF	Ventura Chapter Information
CIF	Ventura Converted Image File
CIL	Clip Gallery Download Package
CIM	CIMEX Cimpack Design Drawing File
CIM	CompuApps Drive Backup Image
CIM	Sim City 2000 File
CIN	Cinetitler Digital Screen Subtitling
CIN	OS/2 Change Control File (tracks changes to an INI file)
CIP	Ghost Keylogger File
CIR	Atari Calamus Importtreiber Rastergraphik = Calamus raster-graphics import driver
CIR	PSpice File
CIR	SuperMax E-CAD Save-File Command
CIS	CheckInbox File
CIT	Atari Calamus Importtreiber Text = Calamus text import driver
CIT	Intergraph Scanned Image
CIV	Atari Calamus Importtreiber Vektorgraphik = Calamus vector-graphics import driver
CIX	TCU Turbo C Utilities Database Index
CK1	Atari Calamus Kontrollkurve 1 Linie = Calamus single control-curve (greyscale pictures)
CK1	iD/Apogee Commander Keen 1 (to 6) Data File (.CK1 to .CK6)
CK3	Atari Calamus Kontrollkurve 3 Linien = Calamus triple control-curve (RGB or DuoChrome)
CK4	Atari Calamus Kontrollkurve 4 Linien = Calamus quadruple control-curve (CMYK or linearity)
CK7	Atari Calamus Kontrollkurve 7 Linien = Calamus septuple control-curve (colour separation)
CKB	Borland C++ Keyboard Mapping File
CKP	Ingres Checkpoint File
CKT	Atari Calamus Kommando-Tasten = Calamus key bindings
CL	Generic LISP Source Code
CL3	Easy CD Creator Layout File
CL4	Easy CD Creator Layout File
CL5	Easy CD Creator Layout File
CLA	CLARION for DOS
CLA	Java Class File (usually .CLASS but can be shortened)
CLASS	Java Class File
CLB	cdrLabel Compact Disc Label
CLB	ICQ Contact List
CLB	MS Office XP Developer Code Librarian
CLF	ListPro File
CLG	Disk Catalog Database
CLG	Maxagrid CTM Log File (text format)
CLK	Corel R.A.V.E. Animation File
CLL	Crick Software Clicker File
CLL	OzWin CompuServe E-mail/Forum Access Custom Library Search
CLO	Cloe Image
CLP	Clipper 5 Compiler Script
CLP	Quattro Pro Clip Art
CLP	Windows Clipboard/Picture File
CLR	1st Reader Binary Color Screen Image
CLR	PhotoStyler Color Definition
CLR	WinEdit Colorization Word List
CLS	C++ Class Definition
CLS	LaTeX Class File (similar to .STY)
CLS	Visual Basic Class Module
CLW	CLARION Database (DOS & Windows)
CLW	MS Visual C++ Class Wizard File
CM	Craftman Data File
CM2	Curious Labs Poser Camera File
CM4	ClipMate Data File
CMA	Applix TM1 Database File (text)
CMA	Atari Calamus Macros
CMB	Chromeleon Backup Archive
CMC	PowerFront File
CMD	1st Reader External Command Menu
CMD	Command file for Windows NT (similar to a DOS .BAT file)
CMD	dBase II Program File
CMD	DOS, CP/M Command File
CMD	OS/2, WinNT Command File
CMF	Corel Metafile
CMF	Creative Music File
CMG	Chessmaster Saved Game
CMK	Card Shop Plus File
CML	Cheat Machine Library File (Windows)
CML	COMAL program file (similar to a BASIC .BAS file)
CML	PADGen Company Info File
CMM	CEnvi (ScriptEase:Desktop) Batch File
CMO	Virtools Behavioral Server Composition
CMP	Address Document
CMP	CorelDRAW PostScript Printer Header
CMP	JPEG Bitmap
CMP	Leadview Bitmap
CMP	MS Word for DOS User Dictionary
CMP	Open Access File
CMP	Route 66 Address Document
CMP	SWAT3 audio compression
CMR	MediaPlayer Movie
CMU	Carnegie Mellon Univeristy Stereo Raster Image
CMV	Corel Move Animation
CMX	Apple Viewer File
CMX	Corel PhotoPaint Image
CMX	Corel Presentation Exchange Image
CMX	The Sims (Maxis) 3D Body Mesh Data
CNC	Click 'n Create File
CNC	CNC General Program Data
CND	ControlDraw File
CNF	Configuration File (used by Telnet, Windows, and other applications with varying internal formats)
CNF	SpeedDial
CNM	Windows Application Menu Options and Setup File
CNQ	Compuworks Design Shop File
CNREG	EULANDA Warenwirtschaft (ERP) Configuration Information
CNREP	EULANDA ERP System Report Template
CNS	W2K Client Connection Manager Export File
CNT	Windows (or other) system content files for the help index and other purposes
CNV	Canvas versions 6, 7, 8
CNV	MS Word Data Conversion File
CNV	WordPerfect Temporary File
CNV	WS_FTP Pro Upload Conversion File Data
COB	Caligari Truespace Format
COB	COBOL Program File
COB	TrueSpace2 Object
COD	Code List
COD	Compiler Program Code
COD	dBase Template Source File
COD	FORTRAN Compiled Code
COD	MS C compiler output as displayable machine language/assembler with original C as comments
COD	Multiplan Data File
COD	SWAT Input Control File (river basin scale model)
COD	Video Text File
COL	Autodesk Color Palette
COL	Lotus Notes Import Column Description File
COL	Multiplan Spreadsheet
COM	Command File (MS-DOS based program)
COMPAT	Likely a text file (e.g., README.COMPAT)
CON	Knowledgeware Consolidation File
CON	Simdir Configuration File
CON	Tree Professional Conifer Creator File
CONF	IRC Related Configuration File (IRCDs or EggDrops)
CONF	Linux Configuration File
CONFIG	MS .NET Application Configuration Information
COO	Fabasoft Components
COP	Tree Professional Conifer Creator Image File
COR	Protein Structure File
COR	Web GPS Correction Server Export File
COR	WMOVIEC Input File
COV	Fax Cover Page (Win2000 Cover Page Editor)
CP8	CP8 256 Gray Scale Image
CPD	Complaints Desk Script
CPD	Corel PrintOffice File
CPD	Fax Coversheet
CPE	Fax Cover document
CPE	Fax Coversheet
CPF	Complete Fax File
CPG	3dize Cool Page File
CPH	Corel Print House Image
CPI	Atari Calamus Preview Import
CPI	Code Page Information
CPI	ColorLab Image
CPI	MS-DOS code page information file
CPJ	CeQuadrant CD Project
CPL	Compel Presentation
CPL	Control Panel Extension/Application
CPL	Corel Color Palette
CPO	Corel Print House File
CPP	C++ code/program
CPP	CA-Cricket Presents Presentation
CPR	Corel Presents Presentation
CPR	INMOS Transputer Development System Occam Program Code Fold
CPR	Knowledge Access Graphics
CPS	Antivirus Checksum File
CPS	Central Point PC Tools Backup
CPS	Classroom Performance System File
CPS	Colored PostScript File
CPT	CA Cricket Presents Template
CPT	Corel PhotoPaint Image
CPT	dBase Encrypted Memo
CPT	MacÊOS Compressed File (Compact Pro)
CPX	Control Panel Applet
CPX	Corel Presentation Exchange Compressed Drawing
CPX	CryptaPix Encrypted Image
CPY	Copy Books Data File
CPZ	COMPOZ Music Text 
CR2	Curious Labs Poser Character File
CRC	Atari Calamus Raster Cache (used by earlier Raster-generator PLUS)
CRD	Atari Calamus Raster Document
CRD	Cardfile (Windows 3.x Database)
CRF	Database Cross-Reference File
CRF	OM2Cipher Recipient File
CRF	Sierra Print Artist Craft
CRF	System Shock 2 Archive
CRF	Thief 2: The Metal Age Archive
CRF	Thief: The Dark Project Archive
CRF	Zortech C++ Cross-Reference File
CRG	Atari Calamus Raster Graphic
CRH	Links Games Course File
CRH	MS Golf Image File
CRI	Atari Calamus Raster Information
CRL	Atari Calamus Raster List (used by earlier Raster-generator PLUS)
CRL	Certificate Revocation List
CRP	Corel Presents Run-Time Presentation
CRP	dBase Encrypted Database
CRP	Visual dBASE Custom Report
CRS	Gold Game Course File
CRS	Links Games Course File
CRS	WordPerfect 5.1 for Windows File Conversion Resource
CRT	Certificate File
CRT	Commodore 64 Cartridge Image (see www.nims.nl/C64/)
CRT	Oracle Terminal Settings Info
CRT	UNIX Crontab File (not a required extension for Crontab)
CRU	CRUSH Compressed Archive
CRW	Canon Raw Format (Image) (ACDSee 4.0)
CRX	Links Games Course File
CRY	Crypto Chat II Encrypted Notebook-content
CRZ	Links Games Course File
CS	C#.NET Source File
CSA	Comma Deliminated Text
CSA	Ultimate Ride Roller Coaster
CSB	CircuitSoft Viewer (a module of EMSI Complete) - (Unverified)
CSB	Corel Photo-Paint Script
CSC	Corel Script
CSD	Bitstream Fontware File
CSD	Chemsoft MSDS Database File
CSE	Atari Calamus Seite = Calamus page
CSF	Van Dyke's CRT/SecureCRT Script File
CSG	Statistica Graph File
CSH	Hamilton Labs C Shell Script File
CSI	Cyberautograph Signed Item
CSK	Claris Works
CSL	Atari Calamus Textstyle List
CSM	Borland C++ 4.5 Precompiled Header
CSM	Borland C++ Symbol File
CSM	Kodak DC265 Camera Script 
CSP	CaseWare Working Papers Script Page
CSP	PC Emcee On-Screen Image
CSQ	Foxpro Queries
CSS	Atari Calamus Stammseite = Calamus master page
CSS	Hypertext Cascading Style Sheet File
CSS	Statistica Datasheet
CSS	Stats+ Datafile
CST	Macromedia Director Cast File
CSV	Comma-Separated Variables (Data File)
CSV	CompuShow Adjusted EGA/VGA Palette
CT	A graphic file associated with the Paint Shop Pro Graphic Editor
CT	Scitex CT Handshake Bitmap
CT0	Maxagrid CTM File Being Processed (text format)
CT1	Maxagrid CTM File Successfully Processed (text format)
CT2	Maxagrid CTM File Unsuccessfully Processed (text format)
CTC	PC Installer Control
CTD	Atari Calamus Text Document
CTD	Cardtable File (text file)
CTD	Cobra Track Dump (COmBined Reconstruction for Atlas)
CTD	Marine Data File (e.g., automatic float data)
CTD	Simpsons Cartoon Studio Export File
CTF	MGI PhotoSuite 1.0/8.0 Album File
CTF	Symphony Character Code Translation
CTF	TIFF Compressed File
CTF	WhereIsIt Catalog
CTG	Canon Powershot Pro 70 Info File
CTG	Cartridge Definition File
CTG	ChessBase Opening Book
CTL	Used in general to mean a file containing control information
    (FAXWorks uses it to keep information about each fax sent and received)
CTM	Content Delivery Service
CTM	Crazytalk Talking Animation File
CTM	FreeBSD Content Management File
CTM	Java Charge Transaction Matrix File
CTM	Maxagrid CTM File (text format)
CTM	SDR99 Speech Recognition Task Time Marked Conversation Input
CTP	American Greetings Greeting Cards
CTP	ChemDraw Template
CTT	Atari Calamus Translation Table
CTT	Hotmail List of E-mail Contacts
CTT	LabView File
CTX	Atari Calamus Text
CTX	Chinese Character Input File
CTX	Compressed Text
CTX	MS Online Course Text
CTX	Pretty Good Privacy (PGP) Ciphertext File
CTX	Visual Basic User Control Binary File
CTY	SimCity City File
CUB	OLAP Cube File (definition for SQL Server, any OLE DB, or ODBC-compliant database)
CUE	Description File for a CD-Image
CUE	MS Cue Cards Data
CUF	Turbo C Utilities Form Definition
CUL	IconForge/ImageForge Cursor Library
CUP	OzWin CompuServe E-mail/Forum Access Catalog Library Update
CUR	Windows cursor (pointer)
CURXPTHEME	Cursor XP File (changes look & function of mouse cursor)
CUT	Dr. Halo Bitmap Graphic
CUT	INMOS Transputer Development System Occam Utility Package
CV	Corel Versions Archive
CV	MS CodeView information screen
CV4	Codeview Colors
CV5	Canvas version 5
CVA	Compaq Diagnostics
CVD	Atari Calamus Vector Document
CVG	Atari Calamus Vector Graphic
CVG	Image File
CVI	Citrix Video Information (see www.rtsl.com/VidFrGlossary.html)
CVP	WinFax Cover Page
CVR	ElectraSoft Fax Cover Sheet
CVR	WinFax Cover Sheet
CVS	Canvas Drawing File
CVS	Outlook Express File
CVS	Sound File
CVT	dBase Converted Database
CVW	Codeview Colors
CW3	Chem Draw Molecular Structure
CW3	Claris Works Win 3 Document (now Filemaker)
CW3	Crossword Construction Kit Puzzle Group
CWB	Atari Calamus Wšrterbuch = Calamus dictionary
CWB	WebNote Document
CWE	Crossword Express
CWK	Claris Works Data (also AppleWorks)
CWS	Claris Works Template (also AppleWorks)
CXE	Common XML Envelope
CXR	Atari Calamus Import/Exporttreiber Rastergraphik = Calamus raster-graphics import/export driver
CXT	Atari Calamus Import/Exporttreiber Text = Calamus text import/export driver
CXT	Macromedia Director Protected Cast File
CXV	Atari Calamus Import/Exporttreiber Vektorgraphik = Calamus vector-graphics import/export driver
CXX	C++ source code file
CXX	Zortech C++ Program
CYN	Cynex Root55 Program Extension
CYP	Cypherus Encrypted Archive
D	D Programming Language Source Code File
D	Dialect Source Code File
D_1	Polytext Ma'archot Meida Co. S"TaM ("Sifriyah Toranit M'muchshevet" - Computerized Torah Library)
D_3	Polytext Ma'archot Meida Co. S"TaM ("Sifriyah Toranit M'muchshevet" - Computerized Torah Library)
D00	Ganbatte! Winamp Plug-in (contains OPL2 music data)
D01	Ganbatte! Winamp Plug-in (contains OPL2 music data)
D2D	3D Fassade Plus 2D/3D Object File
D2S	Diablo II Game File
D3D	CorelDream 3D File
D64	Commodore 64 Emulator Disk Image (see www.nims.nl/C64/)
D8A	AmBiz Productivity Pak Catalog
DAD	Chromeleon Channel Raw Data
DAF	OM2 911 Xchange Version 3 & 6 Document
DAO	IsoBuster File
DAO	Windows Registry Backup
DAP	MS Access Data Access Page
DAP	Omnis5 Application File
DARBY	TheWord & Bible Companion Darby's Bible Translation Bible
DAT	(also possibly) MPEG File
DAT	Data (multiple programs)
DAT	Gunlok Archive
DAT	Mitsubishi DJ-1000 and Photorun Native Format
DAT	Nascar Racing Archive
DAT	System data file
DAT	WordPerfect Merge Data
DB	ANSYS Database
DB	Borland's Paradox (DOS) Data Base table
DB	Paradox Database
DB	Progress Database
DB	SmartWare Office Pac File (requires login)
DB	Solid Database
DB	WindowsXP Thumbnail Database
DB$	Clarion Modula-2 Debug Info
DB$	dBASE Temporary File
DB2	dBase II File
DB3	dBASE III File
DBA	DarkBASIC File
DBA	DataEase Data File
DBB	ANSYS Database Backup
DBB	Mopheus Music File
DBC	MS Visual Foxpro 6 Database Container
DBD	Business Insight Data
DBD	Clarion Modula-2 Debug Info
DBF	Aston-Tate dBASE database
DBF	Database (multiple programs)
DBF	Oracle 8.x Tablespace File
DBF	Table (used by MS Visual FoxProÊ6)
DBG	Debugger configuration (used by MS Visual FoxProÊ6)
DBG	MS C++ Symbolic Debugging Info
DBK	dBase Database Backup
DBK	Orcad Schematic Capture Backup File
DBL	WindowsXP Product Activation File (if on WPA.DBL in the System32 folder)
DBM	Cold Fusion Template
DBM	DataBoss Menu Template
DBM	DataEase Data File
DBM	OzWin CompuServe E-mail/Forum Access SYSOP File
DBO	dBase IV Compiled Program File
DBOOK	Pocket Diary Text
DBQ	Paradox Memo
DBS	SQL Format Database
DBS	Word Printer Description File
DBT	Database Text File
DBV	Flexfile Memo Field File
DBW	DataBoss Database File
DBX	Database (multiple programs)
DBX	DataBeam Image
DBX	MS Visual Foxpro Table
DC	DesignCAD CAD File
DC2	DesignCAD CAD File
DC2	Kodak DC25 Digital Camera File
DC5	DataCAD Drawing File
DCA	IBM DisplayWrite Document Content Architecture Text File
DCA	Visual Basic Active Designer Cache
DCB	Concordance Database Control Block
DCD	Document Content Description File
DCD	FORTRAN Data File
DCD	INMOS Transputer Development System Occam Object Code
DCF	Design Rule for Camera File Systems File
DCF	Disk Image File
DCF	Dyadic Data File
DCF	DynSite Configuration File
DCL	DumpSec
DCM	DCM Module Format
DCP	Delphi Compiled Packages
DCP	OS/2 Data CodePage
DCR	Kodak Proprietary Image Format
DCR	Shockwave File
DCS	ACT! Activity Data File
DCS	Desktop Color Separation file
DCS	Quark Desktop Color Separation Specification
DCT	Database memo (used by MS Visual FoxProÊ6)
DCT	Dictionary (various)
DCT	MS Visual Foxpro Database Container
DCU	Delphi Compiled Unit
DCV	DriveCrypt Volume
DCX	Bitmap Graphics
DCX	Database index (used by MS Visual FoxProÊ6)
DCX	ElectraSoft Fax
DCX	FAX Image
DCX	Fax image (based on PCX)
DCX	Macros
DCX	MS Visual Foxpro Database Container
DCX	PC-Paintbrush File
DD	MacÊOS Compressed Disk Doubler Archive
DDATA	Pocket Diary Text File
DDB	Design Database File (database definition file, possibly MS Access)
DDB	Device-Dependent Bitmap Graphics File
DDB	INMOS Transputer Development System Occam Debugging Info
DDB	Protel 99SE Design Database File
DDE	Dynamic Data Exchange
DDF	Bitstream Fontware File
DDF	BTRIEVE Data Dictionary File (allows other programs to access data)
DDF	Doom Definition File
DDF	Music Library File
DDI	Disk Doubler Image
DDI	DiskDupe Image
DDL	MS Data Definition Language File (SQL Server Query Analyzer)
DDP	Delphi 6 File
DDP	OS/2 Device Driver Profile File
DDS	Adobe Photoshop Compressed Textures
DDS	INMOS Transputer Development System Occam Compiler Descriptor
DDW	CSPro File (combined IMPS and ISSA Census Processing System)
DDX	Juno "Get" File
DEB	Debian Linux Package
DEB	DOS Debug Script
DEC	VersaPro Declaration File
DEF	3D Fassade Plus Define Module File
DEF	C++ Definition
DEF	Defaults
DEF	Definitions
DEF	Geoworks Assembly Header File
DEF	Modula-2 Definition Module File
DEF	SGML Tag Definition
DEF	SmartWare II Data File
DEI	Gerber Design Engineered Interface
DEL	Data
DEM	Descent Demonstration
DEM	USGS Map
DEP	Dependency File (created by the Setup Wizard, used by MS Visual FoxProÊ6)
DEPLOY	DeployMaster Setup Script
DER	Certificate File
DES	Description Text
DES	Pro/DESKTOP File
DES	Quickbooks Template
DES	Tribes 2 Game File
DESK	Card Deck File
DEV	Device Driver
DEV	Device Independent TeX
DEV	LaTeX File
DEZ	DES Encrypted Zip File
DF	Lightscape Parameters
DF1	Omnis7 and Omnis Studio Database File (also .DF2, .DF3, etc.)
DFC	Voicemail File (Trio Voice Communications and maybe others)
DFD	File Flow Diagram Graphic
DFI	Digifont Outline Font Description
DFL	Signature Default Program Settings
DFM	Delphi Forms
DFM	File Flow Diagram Model
DFP	Digital Fusion Plug-in
DFP	Stabilogram Diffusion Analysis File (Requires MatLab)
DFS	Delight Sound File
DFT	Fakt2000 File
DFT	SolidEdge CAD File
DFT	Workshare Synergy File
DFV	Word Print Format Template
DG	Autotrol Graphics
DGC	TurboTax-related File
DGN	Dragon 32 Emulator
DGN	Intergraph Graphics
DGN	Microstation95 CAD Drawing File
DGO	Dimitrius Settings File (Dimitrius is program author)
DGR	DART Pro 98 File Group Details
DGR	Fax Page (MS Outlook Express)
DGS	AT Advanced Diagnostics File
DH	Geoworks Dependency Information File
DHP	Dr. Halo PIC
DHT	Gauss Data File
DHTML	Dynamic Hypertext Mark-up Language document
DIA	Computer Support Corp Diagraph Graphics File
DIB	Device-Independent Bitmap Graphic
DIC	Dictionary (various)
DIF	Data Interchange Format spreadsheet
DIF	DIFF Command Output (patch script)
DIG	Digilink Format
DIG	Sound Designer Audio File
DIG	Text Document
DIN	ADC Labs eWave File (broadcast automation software)
DIN	DataEase File
DIP	Graphics File
DIR	DEC VAX Directory
DIR	Macromedia Director File
DIR	Procomm Plus Dialing Directory
DIR	Worms Armageddon Archive
DIS	Corel Draw Thesaurus
DIS	DATAIR Data Import Specification Layout File
DIS	Ray Tracer File
DIS	VAX Mail Distribution File
DIT	MS Win2000 Active Directory Schema
DIVX	Movie Encoded with DivX-codec
DIZ	Description In Zip File
DJV	DjVu File
DJVU	DjVu File
DJVU	Document format from LizardTech, Inc. (see www.lizardtech.com/solutions/document/)
DKB	DKBTrace Ray-Traced Graphics File
DL	Animation File
DLC	Echelon HQ Configuration File
DLC	Model Dislocation File
DLD	Lotus File
DLG	C++ Dialogue Script
DLG	Dialog Resource Script
DLG	Digital Line Graph (U.S. Geological Survey geographic database)
DLG	Infinity Engine Game Dialog File
DLK	INMOS Transputer Development System Occam Compiler Link Info
DLL	CorelDraw Export/Import Filter
DLL	Windows Dynamic Link Library
DLM	Dirty Little Helper Cheat File
DLS	ADAPTA DLS/32 Supply Chain Planning (ASCII file with general number data)
DLS	Downloadable Sounds (Interactive Music Architecture)
DLS	Norton DiskLock Setup File
DLU	Dirty Little Helper Update File
DM_48	Quake 3 Arena Demo File
DM_57	Return to Castle Wolfenstein Demo File
DM_66	Quake 3 Arena Demo File
DM_67	Quake 3 Arena Demo File
DM2	Quake 2 Demo File
DM3	Quake 3 Arena Demo File
DMC	Medical Manager DML System Compiled Script
DMD	dB2K/dQuery Web DataModule
DMD	OS/2 Warp Device Manager Driver
DMD	Visual dBASE Data Module
DME	Medical Manager DML System Data Merge
DMF	Delusion/XTracker Digital Music File
DMF	Packed Amiga Disk Image
DMF	X-Trakker music module (MOD) file
DMG	Mac OS X Disk Image File (Treated like a real disk)
DML	Darn! Shopping! Mall File
DML	Medical Manager DML System Script
DMO	Derive Demo
DMP	Dump (various)
DMP	INMOS Transputer Development System Occam Core Dump
DMS	Compressed Archive
DMX	Medical Manager DML System Index for Custom .DME Files
DMX	ProTrader Database
DN8	Blue Martini UTF-8 Encoded DNA File (eCRM)
DNA	Blue Martini DNA File (eCRM)
DNA.XML	Blue Martini XDNA File (eCRM)
DNC	Machine Tool Communications
DNE	Darn v5+ (Windows) Events List
DNI	realMyst 3D Archive
DNL	DigitalWebBook Electronic Book (requires installation of DigitalWebBook plug-in)
DNS	DynSite Plug-in File
DO	Stata Batch Analysis File
DOB	User Document Form File
DOC	Adobe FrameMaker or FrameBuilder document
DOC	DisplayWrite 4 File
DOC	Document or Documentation (many programs/formats)
DOC	MS Word Document
DOC	WordPad document
DOC	WordPerfect document
DOC	WordStar document
DOCHTML	MS Word HTML Document
DOCMHTML	MS Word HTML Document
DOG	Laughing Dog Screen Saver
DOH	Geoworks Dependency Information File
DOS	1st Reader External Command File
DOS	MS-DOS based file (also extension for NDIS2 net card and protocol drivers)
DOS	Network Driver File
DOS	Text File/DOS Specification Info
DOT	Corel Lines-Definition
DOT	MS Word Document Template
DOTHTML	MS Word HTML Document Template
DOX	MultiMate Document
DOX	Text File
DOX	User Document Binary Form File
DOZ	VENDINFO Description Out of Zip File
DP	Daily Planner Calendar File
DP	DataPhile Data File
DPA	Serif DrawPlus Animation
DPC	Delphi Package Collection File
DPC	DiscPlay Collection File
DPJ	DeskProto CAM Project File
DPK	Delphi Package File
DPL	Borland Delphi 3 Packed Library
DPL	Digital Photo Librarian Database
DPP	Serif DrawPlus Drawing
DPR	Borland C++ (or Delphi) Default Project (header file)
DPS	DivX XP Skin (.ZIP file format)
DPT	Publish-It! Publication File
DPX	Digital Moving Picture Exchange
DPY	Realpolitik Saved Game
DQA	itaz doQument File
DQD	itaz Default doQument Database
DQY	MS Excel ODBC Query File
DR9	Directory File
DRC	Borland Delphi Compiled Resource File
DRC	DriveCrypt Container File (Note: This extension was changed to .DCV due to a WinXP conflict.)
DRC	Orcad Schematic Capture Design Rules Check Report File
DRES	Diagnosis Results
DRJ	Deraj Data File
DRL	DocObject Resource Locator
DRM	Steinberg Cubase Drum File
DRN	Darn for DOS
DRS	Age of Empires 2 Archive
DRS	WordPerfect Driver Resource
DRV	Device Driver
DRW	Drawing (various)
DRW	Micrografx Designer/Draw
DRW	Micrografx Vector Graphic
DRW	Pro/Engineer Drawing File
DRX	Adobe Photoshop Tutorial
DS	Chemisty Software
DS	PhotoMax Drive
DS4	Micrografx Designer Graphics (ver 4)
DSA	DasyTec DASYLab File
DSB	DasyTec DASYLab File
DSC	Nikon Coolpix Disk Identification File
DSC	Oracle Discard File
DSCE	Diagnosis Scenario
DSD	DataShaper Database File
DSD	Document Structure Definition File
DSES	Diagnosis Session
DSF	Delusion/XTracker Digital Sample
DSF	Micrografx Designer
DSF	PC-TRUST Document Signer (Extension means file is signed)
DSG	Doom Saved Game
DSH	Dashboard PDA Wallpaper
DSK	Borland C++ or Turbo Pascal Project Desktop File
DSK	Novell Driver File
DSL	Lingvo User Feature Dictionary
DSM	Delphi Symbol File
DSM	Digital Sound Module Tracker Format
DSM	Dynamic Studio Music Module (MOD) File
DSN	Object System Designer Design
DSN	ODBC Data Source
DSN	Orcad Schematic Capture Schematic File
DSN	SureThing Office Labeler (formerly DesignExpress) Document
DSP	Dr. Halo Graphic Screen Driver
DSP	MS Developer Studio Project
DSP	Signature Display Parameters
DSQ	Corel QUERY File
DSR	Active Designer File
DSR	WordPerfect Driver
DSS	DCC Active Designer File
DSS	Digital Soup Digital Sound File
DSS	Digital Speech Standard File (Voice Recorders & IBM's ViaVoice)
DST	Embroidery Machine Stitch File
DST	PC-RDist Distribution File
DSW	Borland C++ Desktop Settings
DSW	MS Developer Studio Workspace
DSX	Active Designer Binary File
DSZ	Embroidery Machine Stitch File
DT_	MacÊOS Data File Fork
DTA	Data (Various)
DTA	Hidden & Dangerous Archive
DTA	Stata Binary Saved Datasets
DTD	Document Type Definition of SGML and XML
DTEA	Diagnosis Template Archive
DTF	MS Exchange Header File (Used when sending to Lotus Notes)
DTF	Q&A Database
DTL	Hal/Supernova/Lunar/LunarPlus Screen Readers/Magnifiers
DTM	DigiTrekker Module
DTM	Softshare Delta Translation Map
DTP	Pressworks Template File
DTP	Publish-It! Publication
DTP	SecurDesk! Desktop
DTP	Timeworks Publisher Text Document
DTQ	Database Tools Query
DTX	DocuTech Print6 Engine File (Prints DocuTech Closing Documents)
DTX	E-Book File
DTX	LaTeX Source and Documentation Archive
DTX	LithTech Model Texture File
DUN	Dial-Up Network
DUN	MS Dial-up Networking Export file
DUP	Duplicate Backup
DUS	Readiris Font Dictionary
DV	DESQview Script
DV	Digital Video File (MIME)
DVC	Lotus File
DVF	DV Studio Camcorder Graphics File
DVI	TeX Device Independent Document
DVI	Used to visualize TeX/LaTeX files with Xdvi
DVP	AutoCAD Device Parameter
DVP	DESQview Program Information
DVR	Device Driver
DW2	DesignCAD Drawing File
DWC	Compressed Archive
DWD	DiamondWare Digitized File
DWF	Autodesk WHIP! Drawing Web File
DWF	MS WHIP autoCAD Reader Drawing Web File
DWG	AutoCAD Drawing Database, or older Generic CADD drawing format
DWG	Drafix Drawing
DWI	Dance With Intensity (dance simulator)
DWK	Locked DWG File
DWP	DeScribe Document File
DWP	Dweep Game Levels
DWS	AutoCAD Standartization File
DWS	Dyadic Workspace File
DWT	AutoCAD Template/Prototype File
DWT	Demon's World Game Texture File
DWT	Macromedia Dreamweaver Template File
DWY	Dwyco Video Clip
DX	Digital Electric Corporation (DEC) Data Exchange File
DX	Document Imaging File
DXB	Drawing Interchange Binary
DXF	AutoCAD Drawing Interchange Format
DXF	Drawing Interchange (eXchange) format,a text representation of the binary DWG format
DXL	Dapyx MP3 Explorer (MP3 database organizer)
DXL	DOORS Extension Language
DXMAX	Oozic File
DXN	Fujitsu dexNet Fax Document
DXPACK	DesktopX Object (customizes the Windows Desktop)
DXR	Dependable Strengths Administrator Resources (MacÊOS)
DXR	Green Building Advisor File
DXR	Macromedia Director Protected Movie File
DXTHEME	DesktopX Theme File (customizes the Windows Desktop)
DYN	Lotus File
E	Specman Testbench E-program Source File
E00	ArcInfo Coverage Export File
E01	Encase Forensic Software
E2	thinkdesign CAD Design
E3	thinkdesign CAD Design
EAC	EmEditor Auto Completion File
EAF	Aframe File (suite of generic testing and assessment software)
EAF	FRAGSTATS*ARC File (Landscape Structure/Spatial Pattern Analysis for ARC/INFO)
EAF	MicroEmacs Abbreviation File Format
EAL	Enfocus Action List
EAR	Java Enterprise Application Packaging Unit
EAZ	Express Assist File
EBJ	Geoworks Error Checking Object File
EBO	MS Reader Ebook Format
EBS	WindowsXP Scanner File
EBX	Electronic Book Exchange (Open Source)
ECC	Ecchi Role-playing Format (Generally X-rated Anime File)
ECF	WinFax Office Add-in File
ECO	NetManage ECCO File
ECS	Encrypted Compressed GIS Software Geographic Shape File
ECW	EclipseCrossword Crossword Puzzle
ECW	Ensoniq Waveset Format
ECW2002PUZZLE	EclipseCrossword Puzzle
ECW2002WORDS	EclipseCrossword Word List
ED	EasyDraw CAD File (Japanese CAD program)
ED5	EDMICS Graphics File
ED6	EDMICS Graphics File
EDA	Ensoniq ASR Disk Image
EDB	MS Exchange database files
EDB	ROOTS3 Geneological Data
EDC	Kryptel (light) Decoder/Encoder
EDD	Adobe FrameMaker Element Definition Document
EDE	Ensoniq EPS Disk Image
EDF	Workshare Synergy Document Change Management
EDK	Ensoniq KT Disk Image
EDL	Edit Decision List (management for video and film post production)
EDP	Attachmate Extra! Session
EDQ	Ensoniq SQ1/SQ2/KS32 Disk Image
EDS	Ensoniq SQ80 Disk Image
EDT	VAX Edt Default Settings
EDV	Ensoniq VFX-SD Disk Image
EEB	WordPerfect Equation Editor Button Bar
EFA	Ensoniq ASR File
EFDEMO	Star Trek Voyager Elite Force Demo File
EFE	Ensoniq EPS File
EFF	EverQuest Effects File
EFF	IEEP TeamBG File (modify Infinity Engine games)
EFK	Ensoniq KT File
EFQ	Ensoniq SQ1/SQ2/KS32 File
EFS	Ensoniq SQ80 File
EFT	Chiwriter High Res Screen Characters
EFV	Ensoniq VFX-SD File
EFX	eFax.com Fax Document (Used to be JetFax in 1999)
EGA	Ventura EGA Screen Characters
EGD	GIS Software Encrypted Grid Shape File
EGS	GIS Software Encrypted Grid Shape File
EID	Faena MyID Encrypted File
EID	IBM ViaVoice Vocabulary File
EK5	Simrad EK500 Scientific Echosounder Data
EK6	Simrad EK60 Scientific Echosounder Data
EKM	EXP: The Scientific Word Processor Macro
EL	eMacs Lisp Source Code
ELC	eMacs Lisp Byte-compiled Source Code
ELETTERHEAD	Electronic Letterhead
ELF	Black Belt Systems Extended Layer File
ELF	Tasklink for Windows Machine Control Executable and Linking Format
ELI	Encyclopedia Article List
ELM	MS FrontPage Theme-Pack File
ELT	Event List Text
EMAIL	MS Outlook Express Mail Message
EMB	Everest Embedded Bank File
EMB	IEMBL Nucleotide Format (MIME type chemical/x-embl-dl-nucleotide)
EMBL	IEMBL Nucleotide Format (MIME type chemical/x-embl-dl-nucleotide)
EMD	ABT Extended Module
EMF	Enhanced/Extended Windows Metafile Format
EML	MS Outlook Express Electronic Mail Message (MIME RFC 822)
EMR	Emrite (Wordprocessor file)
EMS	PC Tools Enhanced Menu System Config
EMU	Emulation
EMX	Enigmacross Puzzle File
EMY	Ericsson Ringtone
ENC	BlackIce Evidence Log File
ENC	Encore Music File
ENC	Knowledgeware Encyclopedia
ENC	UUENCODE Encoded File
ENC	Video File
END	Corel Arrow Definition
ENF	EndNote Filter File
ENF	RCEncrypt File
ENG	Dictionary
ENG	EnerGrahics Chart Graphics File
ENG	Sprint Dictionary Engine File
ENL	EndNote Library File (for research papers)
ENR	Enroute Toolath
ENS	EndNote Styles File
ENT	Entrust Entelligence Secured File
ENV	Sierra Print Artist Envelope
ENV	WOPR Enveloper Macro
ENV	WordPerfect Environment
ENW	Sierra LandDesigner 3D Terrain Modeling
ENZ	EndNote Connection File
EOT	MS WEFT Embedded OpenType File
EP2	EclipsePackager Package
EPD	Express Publisher Publication File
EPI	EclipsePackager Invoice
EPI	Express Publisher Document File
EPL	Tallyman E-commerce Software?
EPP	EditPad Pro Project
EPR	Eiffel Project Repository
EPS	Encapsulated PostScript Image File
EPS	Ventura Printer Font
EQL	DART Pro 98 Fabric Equalization Presets
EQN	WordPerfect Equation
ER1	ERWin File
ERD	Entity Relationship Diagram
ERM	Entity Relationship Diagram Model
ERP	British Economics & Social Research Council Electronic Form
ERR	Compilation error (used by MS Visual FoxProÊ6)
ERR	Error Log (various)
ERX	ERWin File
ES	Atari Calamus-module/-driver Eddie Setup (-> Eddie)
ES	EasySIGN Drawing Sheet
ESF	Emblaze Audio File
ESH	Extended Shell Batch File
ESI	Esri Plot File
ESL	MS Visual FoxPro Distributable Support Library
ESP	Ventura File
ESS	EXP: The Scientific Word Processor Style Sheet
EST	MS Streets & Trips 2001 Trip File
ESY	EmEditor Syntax File
ETA	eTreppid Audio File (eTplayer & ETVC media CODEC)
ETC	eTreppid Compressed File
ETH	Ethnograph Document File
ETM	eTreppid Audio File (eTplayer & ETVC media CODEC)
ETV	eTreppid Audio File (eTplayer & ETVC media CODEC)
ETX	SetText Structure Enhanced Text
EUC	Japanese (Kanji)
EUI	Ensoniq EPS Family Compacted Disk Image
EV	EchoView File (sonar fishing data)
EV2	Java File
EV3	EVERLOCK Options File
EVA	Viz Modeler 3D Scene Archive (used for TV graphics)
EVB	Embedded Visual Basic File (used on Pocket PCs)
EVC	EchoView Color Scheme (Echocolor-created data)
EVI	EchoView Index File (speed up processing of echosounder data)
EVK	EVERLOCK File
EVL	EchoView Line File (echosounder time/depth coordinates)
EVR	EchoView Region File (echosounder time/depth coordinates)
EVT	MS WinNT/2000 Event Viewer Log File
EVT	PC Tools Event File Scheduler
EVY	Envoy Document
EWB	Electronics Workbench
EWD	Express Publisher for Windows Document
EWL	EclipseCrossword Word List
EWL	MS Encarta Document
EWP	QuickCog Project File
EWS	QuickCog Sample Set File
EX	EPM Macro File (software install)
EX^	Norton Live Update File
EX2	PC Doctor File (HP computer - unverified)
EX3	Harvard Device Driver (Harvard Graphics taken over by Serif)
EXC	MS Word Exclusion Dictionary
EXC	QEMM Exclude File
EXC	REXX Program
EXC	Text Document
EXD	Control Information Cache
EXE	Executable File (program, application)
EXE	Out-of-process Code Component Used by COM Clients (Component Object Model)
EXE	Settlers IV Saved Game
EXF	Calculus EZ-Fax Fax
EXM	HP Calculator Executable
EXP	ICQ Saved Chat File
EXT	E-mail Text Attachment
EXT	Norton Commander Extension File
EXT	WS-FTP ASCII Binary Transfer File
EXX	IBM LinkWay MsgPut Intermediate File
EYB	Encyclopedia Yearbook File
EZC	EZScreen Screen Saver Editor
EZM	Text File (From some mailing lists)
EZP	Edify Electronic Workforce Backup Utility
EZS	Sunburst Technology Easy Sheet Document
EZT	Sunburst Technology Easy Sheet Template
F	Compressed Archive File (UNIX)
F	FORTRAN Program
F	Newing-Hall Computer Engraving Software Graphic
F00	Kanji Font
F01	Perfect Fax Document
F06	DOS 6 Pixel Screen Font
F07	DOS 7 Pixel Screen Font
F08	DOS 8 Pixel Screen Font
F09	DOS 9 pixel Screen Font
F10	DOS 10 Pixel Screen Font
F11	DOS 11 Pixel Screen Font
F12	DOS 12 Pixel Screen Font
F13	DOS 13 Pixel Screen Font
F14	DOS 14 Pixel Screen Font
F15	DOS 15 Pixel Screen Font
F16	DOS 16 Pixel Screen Font
F2	FLASH BIOS File
F2R	Farandoyle Linear Module Format
F3	FLASH BIOS File
F32	Raw 32-bit IEEE Floating Point Values
F3R	Farandoyle Blocked Module Format
F64	Raw 64-bit IEEE Floating Point Values
F77	FORTRAN 77 Program
F90	FORTRAN Program
F96	Frecom FAX96 Document
FA	EROSION 3D Flow Accumulation
FA1	DATAIR FAS 87/132 Reporter Data File
FA2	DATAIR FAS 87/132 Reporter Custom text File
FAC	FACE Graphic
FAM	Maxis File (unverified)
FAM	The Sims Family File
FAQ	Frequently Asked Questions
FAR	Farandoyle Composer Music Module (MOD) File
FAR	Farandoyle Tracker Music Module
FAR	The Sims (Maxis) Archive File
FAS	3D Fassade Plus Basic Module
FAV	MS Outlook Bar Shortcuts
FAX	Fax File (various, often TIFF format)
FAX	FAX Type image
FBC	FamilyTree Compressed Backup File
FBD	DART Pro 98 User-definied Complex Restoration Filters
FBD	F-22 Lightning Advanced Gravis Joystick Control File
FBD	Honeywell Control Builder File (UMC800 Controllers)
FBD	Remedy Change Management Flashboard
FBD	The Quarterback Pro Coverage Worksheet
FBK	FamilyTree Backup File
FBK	Navison Financials Backup
FBM	Fuzzy Bitmap
FBS	File Burner Skin
FC	Harvard Dictionary (Harvard Graphics taken over by Serif)
FC2	Curious Labs Poser Face File
FCB	FAAST Builder File
FCB	Forest Cover Attribute Processing File
FCD	FastCAD/EasyCAD Output
FCD	IsoBuster File
FCD	Patton & Patton Flow Charting 3 File
FCD	Virtual CD-ROM
FCI	EROSION 3D Inflow Table
FCL	Cyber Audio Library link file
FCM	Fluke Networks CableManager File
FCM	Forward Compression Binary File Patch
FCT	Campaign Cartographer 2 File
FCT	Foxpro Catalog
FCW	Campaign Cartographer 2 File
FD	Dataflex Field Compiler Offsets
FD	FORTRAN Declarations
FDB	Art Explosion Portfolio Catalog File
FDB	Legacy Family Tree Database
FDB	Navison Financials Database
FDF	Adobe Acrobat Forms Document
FDF	Format Definition File (used by PC connectivity packages uploading to midrange systems)
FDL	XYRO Active Distribution Console File Distribution List
FDM	Floppy Disk Manager File
FDR	Final Draft Document File
FDW	F3 Design and Mapping Document Form
FDX	Force Index
FEB	WordPerfect Figure Editor Button Bar
FEM	CADRE Finite Element Mesh File
FEP	MS WEFT Embedding Project
FEX	Focus File
FF	AGFA CompuGraphics Outline Font Description
FF	Sigmac Source File
FFA	MS Fast Find File
FFF	defFax Fax Document
FFF	Folio Flat files
FFF	GUS PnP Bank
FFL	Alien vs Predator Archive
FFL	MS Fast Find File
FFL	PrintMaster Gold Image File
FFO	MS Fast Find File
FFT	DCA/FFT Final Form Text
FFX	MS Fast Find File
FGA	Folder Guard Attributes
FGD	Digital Raster Graphic Metadata File
FGD	Folder Guard Data
FGD	Half-life Modification Map Configuration File (also see .BSP)
FGP	Folder Guard Passwords File
FH10	Macromedia FreeHand 10 Image Document
FH3	Aldus FreeHand 3 Image Document
FH4	Aldus FreeHand 4 Image Document
FH5	Macromedia FreeHand 5 Image Document
FH6	Macromedia FreeHand 6 Image Document (nonexistent version)
FH7	Macromedia FreeHand 7 Image Document
FH8	Macromedia FreeHand 8 Image Document
FH9	Macromedia FreeHand 9 Image Document
FI	FORTRAN Interface File
FIF	Fractal Image Format
FIG	REND386/AVRIL Graphic
FIL	ACL For Windows Data File (data mining software)
FIL	Application Generator File Template
FIL	dBase Files List Object
FIL	WordPerfect Overlay
FIM	Construsyc/Instasyc File
FIN	Perfect Writer Print Formatted Text
FIN	WordPerfect Print Format Text
FIO	ULead Viewer Support File
FIP	FingerPost Information Processor File (REMOTE.FIP is parameter file)
FIRE	FireStarter Project File
FISH	3d Fish Tank Saved Fish
FISHES	3d Fish Tank Saved Fishes
FISHTANK	3d Fish Tank Saved Fishtank
FIT	CCD Camera Image (anything in 'Flexible Image Transfer System' for example X-ray lightcurves, IR spectra, etc.)
FIT	FITS Graphic
FIT	MS Windows NT File Index Table
FITS	CCD Camera Image (anything in 'Flexible Image Transfer System', for example X-ray lightcurves, IR spectra, etc.)
FIX	Generic Patch File
FKY	Foxpro Macro
FKY	Macro (used by MS Visual FoxProÊ6)
FLA	Macromedia Flash Source File
FLB	Papyrus Format Library
FLB	VersaPro Folder Backup
FLC	AutoDesk FLIC Animated Picture
FLC	FLIC Video (may be same as above)
FLD	3D Fassade Plus Field Define Module File
FLD	Charisma Folder
FLD	Hijaak Thumbnail Folder
FLD	VersaPro Folder Contents
FLD	WinFlash Educator Flashcard Options/Statistics File
FLEX	Flexi Data Smoothing (Contact for program)
FLF	Corel Paradox Form
FLF	Firehand Lightning Graphic Collection
FLF	Navison Financials License File
FLF	OS/2 Driver File
FLI	Autodesk FLIC Animation
FLI	EmTeX Font Library
FLL	Foxpro Library
FLL	Visual FoxPro Dynamic Link Library
FLM	"RealPixel" Animation File (various)
FLM	AutoCAD Film
FLM	Medi@Show File
FLO	MicroGrafx FlowCharter File
FLP	Fruityloops Saved File
FLR	Live3D File
FLR	The Sims (Maxis) Floor Texture File
FLS	Farrukh Imposition Purlisher Filelist Document
FLS	WinFlash Educator Flashcard Source File
FLT	Asymetrix Graphics Filter Support File
FLT	Corel Graphic Filter
FLT	Micrografx Picture Publisher Filter
FLT	MS Graphics Filter
FLT	MulitGen Open Flight File
FLT	OS/2 Warp Filter Device Driver
FLT	StarTrekker Music Module (MOD file)
FLT	WinFlash Educator Flashcard Compiled Test File
FLW	Kivio File (KOffice format)
FLX	DataFlex Compiled Binary File
FLX	Dataflex Ordered Binder
FLX	Image File
FLZ	Medi@Show Data File
FLZ	WinFlash Educator Flashcard Compiled Study File
FM	Adobe FrameMaker Document File
FM	FileMaker Pro Spreadsheet
FM1	Lotus Spreadsheet File
FM3	1-2-3 Format File
FM3	Harvard Device Driver (Harvard Graphics taken over by Serif)
FMB	Oracle Binary Form Source Code (version 4.0 and later)
FMB	WordPerfect File Manager Button Bar
FMD	Open Access File
FMF	IBM LinkWay Font or Icon
FMK	PowerStation FORTRAN Make File
FML	GetRight File Mirror List
FML	Oracle Mirror List
FMO	dBase Ordered Format
FMP	FileMaker Pro Document
FMT	dBASE IV Format File
FMT	Format File (used by MS Visual FoxProÊ6)
FMT	MS Schedule+ Print File
FMT	Oracle Text Form Format (version 4.0 and later)
FMT	Style Sheet
FMV	Frame Vector Metafile
FMX	Oracle Executable Form (version 4.0 and later)
FMZ	Form*Z Project File
FN3	Harvard Graphics Font (Harvard Graphics taken over by Serif)
FND	MS Explorer Saved Search
FNG	Font group file (Font Navigator)
FNG	Font Navigator Group File
FNK	FunkTracker Module
FNO	Folio Infobase (may be mistype of .NFO)
FNP	FlashNpack (convert Flash Movies)
FNT	Font File (Windows 3.1)
FNX	Exact Inactive Font
FO1	Borland Turbo C Font
FO2	Borland Turbo C Font
FOG	Computer Generated Forces for Action Fog Defaults
FOG	Fontographer Font
FOL	1st Reader Saved Message Folder
FON	Procomm Plus Call Log
FON	System Font File
FON	Telix Dialing Directory
FOR	FORTRAN Source
FOR	WindowBase Form
FOT	Installed TrueType Font
FOUR	VAX CRYSTALS Chemical Crystallogaphy File
FOX	FoxBase File
FP	FileMaker Pro File
FP	FoxPro Configuration Info
FP1	Flying Pigs for Windows Data
FP3	FileMaker Pro 3.0 File
FP3	Imsi FloorPlan 3D
FP5	FileMaker Pro Document
FPA	Franklin Potter Associates Business Invoice Designer
FPC	FoxPro Catalog File
FPF	Canadian Flight Wizard (flight planning software)
FPK	JetForm FormFlow File (JetForm now Accelio)
FPS	Operation Flashpoint Game File
FPT	FileMaker Pro File
FPT	FoxPro Memo Fields
FPT	Table memo (used by MS Visual FoxProÊ6)
FPW	FloorPlan Plus Floorplan Drawing
FPX	FlashPix Bitmap
FQF	FlashFXP Queue File
FR3	dBase IV Renamed dBaseIII+ Form
FRF	FontMonger Font File (which is then exported as TTF)
FRG	dBase IV Uncompiled Report
FRL	FormFlow File
FRM	Adobe FrameMaker or FrameBuilder Document File
FRM	DataCAD Symbol Report File
FRM	dBASE IV Report File (and others)
FRM	Form File
FRM	Oracle Executable Form (version 3.0 and earlier)
FRM	Visual Basic Form
FRM	WordPerfect Merge Form
FRO	dBase IV Compiled Report
FRO	FormFlow File
FRP	FaxRush Packages (listing of fax files - now .ZPK)
FRP	PerForm Pro Plus Form
FRS	WordPerfect Graphics Driver
FRT	FoxPro Report File
FRT	Report memo (used by MS Visual FoxProÊ6)
FRX	Report File (used by MS Visual FoxProÊ6)
FRX	Visual Basic Binary Form File
FRZ	FormFlow File
FS	Atari Calamus-module/-driver Filter Setup (-> Filter module)
FS	FlexiSIGN File
FS	FormSaver File
FS	NetBSD File (usually BOOT.FS)
FS	PDT Feature Structure File
FSC	Campaign Cartographer 2 File
FSF	Convert It! Factor File
FSF	fPrint Audit Tool File
FSH	EA Sports Game Graphic Editor File
FSI	FileSplit
FSL	Borland's Paradox 7 Forms
FSL	Corel Paradox Saved Form
FSM	Farandoyle Sample Format
FSR	File Substring Replacement Utility
FSS	Iomega Backup File Selection Set
FST	dbFast Linkable Program
FST	FastStats Analyzer File
FSX	FormSaver Fields
FSX	Lotus 1-2-3 Data
FT	Lotus Notes Full Text Index
FTB	Roots3 Index File
FTG	Windows Help Full-text Search Group File
FTM	Family File
FTM	MicroGrafx Font
FTP	FTP Configuration Information
FTS	Full-Text Search Index File resulting from using Find in the Windows Help system
    (Can be erased; will be rebuilt when needed)
FTV	Forest & Trees File
FTW	Family File
FU	F* You Software Key Generator (Software protection breaker)
FUL	Full Foram Count File
FUZZY	Fuzzy Logic File
FVF	Fluke View
FVS	Forest Vegetation Simulator Tree Data File
FVT	Interlock Public Computer Utility
FW	Framework Database
FW2	Framework II File
FW3	Framework III File
FW4	Framework IV File
FWB	FileWrangler Data File Backup
FWL	FileWrangler EXE Library
FWS	FileWrangler Data File for File Splitting Configuration
FX	FastLynx On-Line Guide
FXD	FAXit Phonebook
FXD	WinFax Sent Document (TIFF format)
FXI	File-Ex File
FXM	WinFax & WinFax MiniViewer Fax
FXO	Fax Image Document
FXP	Compiled program (used by MS Visual FoxProÊ6)
FXR	WinFax Received Document (TIFF format)
FXS	WinFax Fax Transmit Graphic
FZB	Casio FZ-1 Bank Dump
FZF	Casio FZ-1 Full Dump
FZF	FontZip Font Packer
FZV	Casio FZ-1 Voice Dump
G	Applause Data Chart
G	Cliq Accessories Datebook Schedule Group
G3	G3 FAX File
G32	GFA BASIC 32 Program File
G32	PaperPort File
G3D	GenDesigner 3.x Genealogy Database
G3F	Zetafax TIFF File (fine resolution)
G3N	Zetafax TIFF File (normal resolution)
G4	GTX RasterCAD File
G42	ADAPTA DLS/32 Supply Chain Planning (ASCII file with info about SKUs and product-groups)
G53	ADAPTA DLS/32 Supply Chain Planning (ASCII file with info about Bills of Material)
G8	PicLab Plane Three Graphics
GAC	Global Audio Control Skin
GAL	Corel Multimedia Manager Album
GAL	Gallery of Pictures
GAM	Animated E-mail
GAM	Baldur's Gate Game File
GAM	GammaFax Fax Document
GAM	TADS 2.x Game File
GAT	Gator File
GAU	Gaussian Input File (MIME type chemical/x-gaussian-input)
GAU	MS Flight Simulator Gauge (e.g., altimiter.gau)
GB	Nintendo GameBoy Emulator ROM Image File
GBA	GrabIt Batch Files
GBA	Nintendo Game Boy Advance ROM Image
GBC	Nintendo GameBoy Color Emulator ROM Image File
GBK	Interbase Database Backup
GBL	VAXTPU Global Definitions (VAXTPU is default OpenVMS editor)
GBT	Adobe Photoshop File
GC	Sierra Print Artist Greeting Card
GC1	Golden Common Lisp Source Code
GC3	Golden Common Lisp Source Code
GCA	G Compression Archiver Compressed File (MIME type application/x-gca-compressed)
GCA	GOCA Graphics File
GCC	VISUAL EPR COSEUL.EXE Result (table of components of Cartesian tensors)
GCD	Genericª CADD Drawing (later versions)
GCD	GNUe Class Definition
GCD	IsoBuster File
GCD	Prassi CD Image
GCF	WinXComp Grouped Compressed File
GCI	GTA2 Game File
GCI	VISUAL EPR COSEUL.EXE Result (table of components of irreducible tensors)
GCM	GeoConcept Map File
GCM	Group Mail CMessage Store File
GCP	Ground Control Point file used in image processing of remote sensing data
    often to form map projections (CHIPS [CopenHagen Image Processing System] uses these files)
GCR	VISUAL EPR COSEUL.EXE Output
GCT	ApplinX Screen Scrapper
GDB	Group Mail File
GDB	Interbase Database
GDF	GEOS Dictionary
GDM	Bells, Whistles, and Sound Boards Module
GDR	SymbianOS Bitmap Font File (can contain multiple typefaces)
GDS	Chip Layout Information
GDS	Image File
GED	Arts & Letters Graphics File
GED	EnerGraphics File
GED	GEDCOM Family History File
GED	Graphic Environment Document (drawing)
GEL	Gel image, Produced by ImageQuant software (essentially a TIFF file)
GEM	GEM (a desktop interface) Metafile
GEM	Ventura Publisher Vector Graphics
GEN	Chromeleon Generic Driver Configuration
GEN	dBase Application Generator Compiled Template
GEN	Ventura-Generated Text File
GEO	GeoSoft Compressed Add-on
GEO	Geoworks Geode
GEO	VideoScope File
GER	GerberView File (partial support for extended Gerber [RS-274X] file format)
GetRight	GetRight Unfinished-Download file
GF	Geometric Data
GF	gFx UNIX Plotting Program
GF	METAFONT Generic Font File
GF	Pilot Logbook for Grok File
GF	Starfleet Command - Empires At War File
GFA	Bitmap Graphics File (see .GFX/Warcraft; files are similar)
GFB	GIFBlast Compressed GIF Image
GFC	Patton&Patton Flowcharting 4 Flowchart File
GFD	Menus for GNUe Forms
GFD	VISUAL EPR Energy, Fields File
GFI	Genigraphics Graphics Link Presentation
GFT	NeoPaint Font
GFX	Genigraphics Graphics Link Presentation
GFX	WarCraft II Image File
GFY	Grafical 1.0 File
GG	Gridgen File
GG	Sega GameGear Game ROM Image
GG	Sigmac Compiled Machine Code
GG1	Goofy Golf Deluxe Course
GG2	Goofy Golf Deluxe Saved Game
GGI	GGI Extension
GGP	GemCom Graphic Format
GHO	Symantec Ghost Disk Image File
GHS	Lasertank High Scores
GI	Sony CD Extreme Global Image File
GIB	Graph-in-the-Box Chart
GID	Windows Help Global Index File (containing help status)
GIF	Graphic Interchange Format (CompuServe bitmap)
GIG	Sound File
GIM	Genigraphics Graphics Link Presentation
GIW	Graph-in-the-Box Presentation
GIX	Genigraphics Graphics Link Presentation
GJD	11th Hour Game Archive
GJD	7th Guest Game Archive
GJD	GetJet Professional Database (really an Access database)
GJF	Gaussian Input Data File
GKH	Ensoniq EPS Family Disk Image
GKS	Gravis GripKey Document
GL	GRASP - Graphical System for Presentation File
GLM	Glim Data File
GLP	Glippo 2000 file (see www.nims.nl/g2000/)
GLY	MS Word Glossary
GMAX	gmax Game Creator
GMF	Applause CGM Graphics
GMM	Group Mail Message Log File
GMP	Geomorph Tile Map
GMP	Group Mail List Information File
GMP	GTA2 Game File
GMR	Schlafhorst Automation Graphical Monitor Record
GMS	Corel Global Macro File
GMX	Group Mail Message File
GNA	Genigraphics Graphics Link Presentation
GNO	Genopro Genealogy Document File
GNT	Micro Focus Generated Code
GNX	Genigraphics Graphics Link Presentation
GOB	Dark Forces Game File
GOB	Indiana Jones 3D Archive
GOC	Geoworks Goc Source Code
GOH	Geoworks Goc Header
GP	Geoworks Glue Geode Parameter File
GP3	CCITT Group 3 File (fax)
GP3	GuitarPro 3
GP4	CCITT Group 4 File (fax)
GPD	VISUAL EPR Input Data for PARAMS.EXE
GPF	Believed to be a Japanese graphic file
GPG	GnuPG Encrypted File (usually compatible with .PGP files)
GPH	Lotus 1-2-3 Graph
GPH	Stata Graph
GPK	Omnigo Program Package
GPL	GPS Log File (used by mapping software)
GPP	GraphPap Graph Paper File
GPP	Serif GraphicsPlus Object
GPR	VISUAL EPR PARAMS.EXE Results
GPS	Pocket CoPilot GPS Tracks Data File
GPX	BASIS File
GQA	BI/Query Data Model Admin Layer
GQL	BI/Query Data Model (used to be Andyne GQL)
GQU	BI/Query Data Model User Layer
GR2	Windows 3.0 Screen Driver
GR3	Windows 3.0 Screen Grabber
GRA	MS Flight Simulator File
GRA	MS Graph Chart
GRA	SigmaPlot Data File
GRA	STN Express Transcript Graphics File
GRB	MS-DOS Shell Monitor
GRD	Gradebook Power File
GRD	Grid file, used in image processing of remote sensing data often
    to form map projections (CHIPS [CopenHagen Image Processing System] uses these files)
GRF	DLG "Graphic" Format
GRF	Golden Software Graph File
GRF	Grafix Idea File
GRF	Graph Edit File (Part of DirectX SDK)
GRF	Graph Plus Graph File
GRL	Matlab Graphic Format
GRM	VISUAL EPR Input Data for FIntGraf
GRN	Granny 3D Rendering Program
GRO	Serious Sam Game File
GRO	Warlords Battlecry Archive
GRP	Duke Nukem 3D Archive
GRP	PixBase Pictures Group
GRP	Program Manager Group file
GRP	Shadow Warrior Archive
GRP	Windows Program Manager Group
GRQ	Quickstep Barco Graphics
GRS	Packedge Barco Graphics
GRT	VISUAL EPR Calculation Results of Fields
GRV	Groove Networks File
GRX	GetRight File List
GRY	Picture File (raw GREY graphics)
GS1	GraphShow Presentation
GSC	GeneStudio File (Molecular Biology Software)
GSD	Professional Draw Vector Graphics
GSM	Raw GSM 6.10 Audio Stream (Global System for Mobile Audio)
GSM	Sound File
GSM	US Robotics Modem File
GSP	Geometer's Sketchpad Material File
GSW	GraphShow Worksheet
GT2	Graoumftracker (new) Music Module (MOD) File
GTK	Graoumftracker (old) Music Module (MOD) File
GTP	GuitarPro File
GTS	Genome Software Tempo Alarm Clock
GTY	Gibson Tray File
GUP	PopMail Data
GV	Grandview (DOS-based outline program by John Friend who licensed to Living Videotext; bought by Symantec)
GWI	Groupwise File (binary file that contains link information)
GWP	Greetings WorkShop File
GWX	Genigraphics Graphics Link Presentation
GWZ	Genigraphics Graphics Link Presentation
GX1	Show Partner Graphics File
GX2	Show Partner Graphics File
GXC	General CADD Pro File
GXD	General CADD Pro File
GXD	Jeol EX Spectrometer Data File
GXF	General CADD Pro File
GXL	Genus Graphics Library
GXM	General CADD Pro File
GXP	Jeol EX Spectrometer Data File
GXR	Genexus Report Viewer
GXT	GTA2 Game File
GZ	UNIX Gzip Compressed Archive File
GZIP	UNIX Gzip Compressed Archive File (more usually seen as .GZ)
H	Header File (usually C Compiler)
H--	Sphinx C-- Header File
H!	Flambeaux Tutorial Database
H++	C++ Header File
HA	Compressed Archive File
HAD	MixlleniumEngine (Haydee) Web Server Module Style File (XML format)
HAL	Mortyr Archive
HAM	Image File
HAP	Compressed Archive File
HAT	HAT (HOORA Analysis Tool) Model
HAY	MixlleniumEngine (Haydee) Web Server Module Content File (XML format)
HBC	Home Buyers Calculator Suite
HBK	Humanic Software Accounting Data
HBK	Mathcad Handbook
HC	BI/Suite Hypercube
HCM	IBM HCM Configuration
HCR	IBM HCD/HCM Production Configuration
HCT	Symantec Anti-Virus Live Update File
HD2	Curious Labs Poser Hand File
HDA	HotDocs Document
HDF	Help Development Kit Help File
HDF	Hierarchical Data Format File
HDL	Procomm Plus Alternate Download File Listing
HDML	Handheld Markup Language File (WAP phones; browser prior to 4.X)
HDP	Magix Music/Video
HDR	Adobe Photoshop File
HDR	Egret Data File
HDR	PC-File+ Database Header
HDR	Procomm Plus Message Header
HDW	Harvard Draw Vector Graphics
HDX	Help Index (Various)
HED	HighEdit Document
HEL	MS Hellbender Saved Game
HEX	Hex Dump
HEX	MacÊOS BinHex 2.0 File
HFI	HP Font Info
HFS	MacÊOS Disk Image on CD
HFX	HotFax File
HFX	US Robotics Rapid Comm Voice Data File
HFZ	Pinnacle Studio Video Editing File
HGH	Star Wars - Tie Fighter High Score
HGL	HP Graphics Language Drawing (plotter)
HH	C++ Header
HH	Help Topic Map File
HHC	Table of Contents File (HHW Application)
HHC	TurboTax Contents File
HHH	Power C Precompiled Header
HHK	Help Workshop Index File
HHP	HTML Help Project
HHP	Procomm Plus Help Data
HIN	HyperChem Molecule
HIT	HitPlayer Audio File
HIT	Nonags Dialog Killer Data File
HIT	The Sims (Maxis) Sound File
HJT	TreePad Hypertext Database File
HLB	VAX Help Library
HLP	Stata Statistical Software Help File (Text files whose format predates Windows)
HLP	Windows Help File
HM~	Help&Manual Backup Help File Project
HM2	Help&Manual Help File Project
HMI	Descent Human Machine Interfaces MIDI File
HMM	Procomm Plus Alternate Mail Read Option Menu
HMP	Descent Human Machine Interfaces MIDI File
HMX	MixlleniumEngine (Haydee) Web Server Module Template File (XML format)
HNF	Humax Receiver Settings
HNV	TheWord & Bible Companion Hebrew Names Version Bible
HO	Magix Music/Video
HOF	Hall Of Fame (scores)
HOG	Descent Mission File
HOG	Lucas Arts Dark Forces WAD File
HOT	The Sims (Maxis) Sound File
HP	HP Graphics Language (plotter)
HP8	HP NewWave Write ASCII Roman8 Character Set
HPD	Harry Potter Related
HPF	Adobe PageMaker HP LaserJet Fonts
HPF	HotLine Partial Download File
HPG	HP Graphics Language (plotter)
HPGL	HP Graphics Language (plotter)
HPI	Gem Font Information
HPI	Hemera Photo-Object Image
HPJ	Visual Basic Help Project File
HPK	Compressed Archive File
HPL	HP Graphics File
HPM	HP NewWave Emm Text
HPM	Procomm Plus Alternate Main Menu
HPP	C++ Program Header
HPP	InfoMgr Database File
HPP	Zortech C++ Header
HPR	RoboHELP Configuration File
HQX	MacÊOS BinHex 4 Compressed Archive File
HQX	WinXP Game File
HR2	Curious Labs Poser Hair File
HRF	Hitachi Raster Format Graphic
HRL	Herolab EasyWin32
HRM	Procomm Plus Alternate Main Menu
HRX	Herolab EasyWin32
HRZ	Image File
HS	Hugs Source Code
HS2	Postering Monochrome Image
HSC	HelpScribble Project
HSI	Handmade Software Graphic File
HSK	Nimbus 7 SAMS Data File (Daily ASCII files)
HSM	The Sims (Maxis) Sound File
HSQ	Data File Associated with Qaz Trojan
HSS	Adobe Photoshop Hue/Saturation Information
HST	File Associated with WordPerfect (history?)
HST	History File
HST	Host File
HST	Procomm Plus History File
HST	Symantec AntiVirus Live Update File
HT	HyperTerminal File
HTA	Hypertext Application (run apps from HTML doc)
HTACCESS	Apache Access Configuration File
HTC	HTML Component (mechanism for implementing Dynamic HTML in script)
HTF	WebBase File
HTI	WebBase File
HTM	Hypertext Markup Language (HTML) Document
HTML	Hypertext Markup Language (HTML) Document
HTT	MS Hypertext Template
HTX	Extended Hypertext Template
HTX	Internet Database Connector File
HULL	Halflife Map Collision Hull File
HUS	Husqvarna Designer I Embroidery Machine Format
HUY	Eto Dlia Vas
HWCFG	VersaPro Hardware Configuration File
HWD	Hollywood Presentation File
HWL	Hangman Deluxe Word List
HWP	Hangul (Korean) Word Processor File
HXM	Descent2 HAM File
HXM	Procomm Plus Alternate Protocol Selection Menu
HXX	C++ Header
HY1	Ventura Publisher Hyphenation Algorythm
HY2	Ventura Publisher Hyphenation Algorythm
HYC	WordPerfect Hyphenation File
HYD	WordPerfect Hyphenation Dictionary
HYP	Compressed Archive File
HYP	Hypertext File
HYP	Hyphenation File
I	Borland C++ Intermediate File
I	Progress Include File
I66	Interactive66 Graphic Design Information
IAF	MS Outlook 97 and 2000 E-mail Account Settings
IAM	Autodesk Inventor CAD File
IAN	Sterling Software COOL Business Team Model File
IAP	TeamBG File (modify Infinity Engine games)
IAX	IBM Image Access Executive Bitmap
IBA	MDE InfoHandler Infobase File
IBM	Archdos Compressed File (IBM internal file)
IBM	Image File
IBS	i2 iBase File
ICA	Citrix File
ICA	Image Object Content Architecture (IOCA) Graphics File
ICB	Targa Bitmap
ICC	IronCAD Catalog
ICC	Kodak Printer Image
ICD	IronCAD 2D CAD File
ICE	Archive File
ICL	Icon Library File (an industry standard)
ICM	ICC Profile, Acer Monotor Drive
ICM	Image Color Matching Profile File
ICN	AT&T Graphic Format
ICN	Icon Program
ICO	Icon ImageForge/IconForge
ICO	Windows Icon
ICS	Inovate 3D CAD File
ICS	IronCAD 3D CAD File
ICS	MS Outlook Calendar File
ICS	SwiftView Command File
ICW	InterCAD File
ID	Disk Identification File
ID	Lotus Notes ID File
IDA	MS Server File
IDB	MS Developer Intermediate File
IDD	MIDI Instrument Definition
IDE	Borland C++ Project
IDE	Integrated Development Environment Configuration File
IDE	Sophos Anti-Virus Virus IDEntity File
IDF	MIDI Instruments Drivers File
IDI	i-deas Web ACCESS File
IDIF	Netscape Saved Address Book
IDL	MS Visual C++ Interface Definition File
IDL	OMG CORBA Interface Definition Language
IDQ	Internet Data Query File
IDW	Aldus IntelliDraw Vector Graphic
IDW	Autodesk Inventor CAD File
IDX	Index (multiple programs)
IDX	Index, compact index (used by MS Visual FoxProÊ6)
IDX	Symantec Q&A relational database index file
IDY	Debug Information File (IMS Database related)
IDZ	i-deas Web ACCESS File
IEF	Image File
IES	Photometric File Data
IFD	Jet Form Design Form
IFF	Amiga ILBM
IFF	Graphic, Sound (Interchangeable File Format)
IFF	SUn TAAC Image File
IFF	The Sims (Maxis) Object/Data File
IFO	DVD Info File (contains menus and other information)
IFP	KnowledgeMan Script
IFS	IconForge Image EXE Library
IFS	OS/2 Warp Installable File System
IFS	Yuvpak Compressed Fractal Image
IFX	ImageSoft v2.00 Graphic
IGES	IGES-Format
IGF	Inset Systems Metafile
IGNORE	Likely a text file (e.g., README.IGNORE)
IGP	Igor Reader Sheet Music File
IGS	IGES-Format
IIF	QuickBooks for Windows Interchange File
III	Intel Phone Compatible
IIX	Trados Workbench translation memory system file
IL	Icon Library
ILB	Scream Tracker Data
ILBM	A bitmap (graphic image) file
ILK	MS ILink Program Format Outline
ILL	Adobe Illustrator Prologue
ILM	CAS 200 QDA v3.0 Image List Mode File (DNA mapping)
ILM	Illuminatus Opus Multimedia File
ILM	Iomega Zip Drive Speed Configuration File
ILM	Satsang Quiz File
ILPLOPTIONS	InterLock and PowerLock (public computer management utility)
ILPLVOUCHERS	InterLock and PowerLock (public computer management utility)
IM8	Sun Raster Graphic
IMA	Mirage Vector Graphics
IMA	WinImage File
IMB	IncrediMail File
IMF	ImageForge/ImageForge Image EXE Library
IMF	IncrediMail Letter
IMG	Bitmap Graphic (several programs)
IMG	CloneCd Related File
IMG	ERDAS IMAGINE Format
IMG	Floppy Image File
IMG	GEM image
IMG	MacÊOS Disk Copy Format
IMI	IncrediMail Animation
IMJ	JFIF File With a MS Windows BMP Header (Pegasus Image Corporation)
IMN	IncrediMail Notifier
IMP	Babya Installer Archive
IMP	DVD File
IMP	Lotus Improv Spreadsheet
IMP	Urban Chaos Game File
IMQ	ImageQ Presentation
IMR	Cognos Impromptu Report Writer
IMS	Incredimail Graphic
IMV	Yahoo Instant Messenger IMVironment
IMW	Imageware Surfacer 3D CAD Surface Geometry
IMW	IncrediMail Sound
IMY	iMelody Ringtone Format (link is PDF file)
IMZ	Compressed Floppy Image
IN$	HP NewWave Install File
IN3	Harvard Input Device Driver (Harvard Graphics taken over by Serif)
INB	Vermont HighText Script
INB	Visual Expert Source Code Documentation
INC	Assembler language or Active Server include file
INC	Include File (various)
INC	Internet Connection File (used by ISPs)
IND	dBase IV or DataPerfect Index
IND	Well of Souls Game File
INDD	Adobe InDesign Document
INF	Information or Setup File (many)
INFO	Amiga Information File
INI	Configuration settings (Initialization file)
INK	Mimio Ink File
INK	Pantone Reference File
INL	MS Visual C++ Inline Function File
INP	GIS Software Text Input File
INP	Oracle Source Code for form (version 3.0 and earlier)
INP	Self-Extracting Archive Utility Project
INS	1st Reader Install Script
INS	AdLib Instrument Music File
INS	Ensoniq EPS Family Instrument
INS	Inspiration Mind Mapping Software File
INS	InstallShield Install Script
INS	Internet Communication Setting
INS	Sample Cell / II Instrument
INS	WordPerfect File
INS	X-Internet Sign-up File
INSTALL	Likely a text file (e.g., README.INSTALL)
INT	Atari Calamus-module/-driver RasterCache internal (RasterCache Generator: RCACHE.INT)
INT	Borland Interface Units
INT	Foxpro Code Page
INT	Intermediate Code used for syntax checking (various)
INT	Signature Semi-compiled Program
INT	Unreal Tournament Mutator
INTER	Interspector Project File
INTO	Interspector Object File
INX	ACL For Windows Index (data mining software)
INX	Foxbase Index
IO	Compressed Archive
IOB	Imagine File
IOB	TDDD Format 3D Graphic Database
IOC	Instant ORGcharting! Organization Chart
IOF	Findit Document
ION	4DOS File Description
ION	Text Program/Installation Description
IP	IconPackager File (changes the look of Windows icons)
IPD	InstallPROG 6 EDBS Install Database
IPF	MS SMS Installer Script (with System Management Server 2.0)
IPL	Corel Pantone Spot Reference Palette
IPL	InstallPROG 6 EDBS File Library
IPR	IntelliJ Project XML File
IPS	Game Patch File (allows running of illegal copies of some games)
IPT	Autodesk Inventor CAD File
IPW	UniPlot Graph
IPX	Interactive Pictures Corporation AV File
IPZ	ICQ Skin
IQF	Integra 3.0 Query File
IQY	Excel Web Query
IQY	MS Internet Inquiry file
IRD	MS Money Temporary File
IRS	WordPerfect Resource File
ISD	GraphPad InStat
ISD	InstallShield Dialog
ISD	RapidFile Dictionary
ISH	Compressed Archive File
ISO	File List for CD-ROM
ISO	InstallShield Uninstall File
ISO	ISO Buster File
ISO	ISO-9660 Table
ISO	Lists the files on a CD-ROM; based on the ISO 9660 CD-ROM file system standard
ISP	Internet Communication Settings
ISP	X-Internet Sign-up File
ISR	MS Streets & Trips Route File
ISR	Uninstaller Text File
ISS	InstallShield Response File
IST	Digitrakker Instrument File (by n-FaCToR)
ISU	Easy CD Creator 4 Uninstall File
ISU	InstallShield Uninstall Script
ISU	Netscape File
IT	Impulse Tracker Music Module (MOD) File
IT	Intalk Settings
ITE	E-Tabs Reader File
ITF	Inside Tract File
ITF	JPI TopSpeed Pascal Interface File
ITI	Impulse Tracker Instrument
ITM	Infinity Engine Game Item
ITS	Impulse Tracker Sample
ITS	Internet Document Set
ITS	Internet document set (possibly a MS file)
IV	Open Inventor File
IV	VRML File
IVF	Indeo Video File
IW	Iconware Application
IW	Idlewild Screensaver
IWA	IBM Writing Assistant Text
IWC	Installwatch Database (install monitor)
IWI	Ignite Image Optimiser
IWP	Wang Text File
IWR	i*write 2.0 File
IWR_BAK	i*write 2.0 Backup File
IX	Adobe FrameMaker Index File
IX	Paperport Search File
IZD	Intrexx Application Export Format (binary)
IZT	Izl Binary Token
J	JAR Compressed File
J	Java Source Code
J62	Ricoh Camera File
JAG	Jaguar Server File (Atari)
JAR	Java Archive File (a compressed file for applets and related files)
JAR	Java ARchive file (a compressed file for applets and related files)
JAS	Compressed Graphic
JAV	Java Source Code
JAVA	Java Source Code
JAVA	JBuilder Java File
JBC	BestCrypt File
JBC	Jam Byte-Code Hex File (8051 Microprocessor File)
JBD	SigmaScan Data File
JBF	Paint Shop Pro Image Browser File
JBK	Juno Backup File
JBP	DJ Jukebox Project
JBX	Project Scheduler File
JC!	FlashGet File
JDB	Siren Jukebox
JDE	Cariverona
JDF	Turok 2 Game File
JDT	Accelio Capture Classic (JetForm) Filler (JetForm Corp became Accelio 12 Sep 2001)
JDX	EDICT Index (EDICT is Japanese/English Dictionary)
JEF	Janome NH10000 Sewing Machine File
JET	Hybrid JetFax Fax
JFD	FormWare Job
JFD	JAWS Voice Synthesis Software
JFF	JPEG Image File
JFI	Image File
JFIF	JPEG Image File
JFM	Accelio Capture Classic (JetForm) File (JetForm Corp became Accelio 12 Sep 2001)
JFX	J2 Fax File
JG6	BigJig Jigsaw
JHTML	Dynamo Server Page (Java HTML)
JIF	JPEG Image File
JLF	JetLinks Bookmark Managment
JMP	SAS JMPDiscovery Chart-to-statistics File
JMS	Voxtron TeleButler Graphical Voice Response Call Flow
JN1	Epic MegaGames Jill of the Jungle Data File
JNB	Sigma Plot Workbook File
JNG	JPEG Network Graphic
JNK	Junk (temporary file)
JNL	Ingres Journal File
JOB	AI Research File
JOB	Atari Calamus-module/-driver Job List (TIFF-Spooler)
JOB	Job File
JOB	QuestVision Vector Graphics File (IMG File Conversion)
JOB	Task Scheduler Task Object
JOR	MS SQL Server Journal File
JOT	JDesignerPro File
JOT	WinJottr Desktop Note
JOU	VAX Edt Editor Journal Backup
JPC	Picture File (Japanese)
JPE	JPEG Image File
JPEG	JPEG Image File
JPG	JPEG Image File
JPL	Siren Jukebox
JPX	JBuilder Project File
JS	JavaScript Source Code
JSB	Henter-Joyce, Inc. Jaws Script Binary File (Screen reader program)
JSD	eFAX Jet Suite Document
JSD	Henter-Joyce, Inc. Jaws Script Documentation File (Screen reader program)
JSD	Join-Split File
JSE	JScript Encoded Script File
JSH	Henter-Joyce, Inc. Jaws Script Header File (Screen reader program)
JSL	PaintShop Pro File
JSM	Henter-Joyce, Inc. Jaws Script Message File (Screen reader program)
JSP	Java Server Page
JSS	Henter-Joyce, Inc. Jaws Script Source File (Screen reader program)
JT	JT Fax
JTD	Ichitaro 11 (major Japanese word processor)
JTF	Hayes JT Fax
JTF	JPEG Tagged Interchange Format Image
JTK	Sun Java ToolKit File
JTP	JetForm File
JVC	Digital Camera File
JW	Justwrite Text
JWL	Easy CD Creator's CD Label
JWL	Justwrite Text File Library
JWP	Easy CD Creator Label File
JWP	JWP Document (Japanese word processor)
JZZ	Jazz Spreadsheet
K	Desktop Color Separation Specification Black Layer (usually an EPS file)
K25	Kodak DC25 Digital Camera File
K25	Kurzweil 2500 Sample
KAP	MapInfo Sea Chart
KAR	Karaoke MIDI File
KAU	KeyAudit Software Audit
KB	Borland C++ Keyboard Script
KB	Knowledge Pro Source Code
KBD	Keyboard layout
KBD	Keyboard Script File Layout (various)
KBI	Keirsey-Bates Temperament Sorter Index
KBM	Reflection Keyboard Script File Layout
KBP	Keirsey-Bates Temperament Sorter Profile
KBR	Keirsey-Bates Temperament Sorter Data
KCL	Kyoto Common LISP Source Code
KCP	Keychamp File
KDC	Kodak Photo-Enhancer
KDC	Kodak Photo-Enhancer/Photogen File (raw bitmap image)
KDF	Kinkos Photo
KED	KEDIT Profile and Macro File (DOS-based version of IBM XEDIT)
KEX	KEDIT Macro File
KEY	DataCAD Icon Toolbar File
KEY	Forecast Pro Datafile
KEY	Keyboard Macros
KEY	Program Security or Registration File (various)
KEY	Sentry 2020 Encryption File
KEY	Top Secret Crypto File
KFA	Dark Age of Camelot Animation
KFO	KFormula File (KOffice format)
KFX	Kofax Group 4 Image File
KGB	File encrypted with the Kremlin encyption program (see www.kremlinencrypt.com)
KIC	Kodak Image Compression File
KIF	Autodesk AutoCAD Key Index File
KIT	Raven Toolkit File
KIX	KixTart Script (Win NT login scripts)
KIZ	Kodak Digital Postcard File
KJV	TheWord & Bible Companion King James Version Bible
KKW	RoboHELP Keyword Help project Index File
KMN	SIL Hebrew Font System Keyboard
KMP	Korg Trinity KeyMaP File
KNF	Universal Flat Knitting Machine Pattern Design
KNO	Personal Knowbase File
KON	Kontour File (KOffice format)
KOS	MicroType Pro Document
KPG	Kai's Power Goo Graphic
KPP	SmartPad Toolpad
KPR	KPresenter File (KOffice format)
KPS	IBM KIPS Bitmap
KQP	Konica Quality Picture (Konica Photo Imaging on-line photo service)
KR1	Kurzweil 2000 Sample (multi-floppy)
KRX	Karaoke MIDI File
KRY	Herolab Krypten
KRZ	Kurzweil 2000 Sample
KS	SOF Game File Log
KSC	Korg Trinity Script
KSE	Keepsake Studio Export File
KSF	Korg Trinity Sample
KSH	Prodigy Internet Registration File
KSP	KSpread File (KOffice format)
KST	Olivetti Olitext Plus Script File
KTT	KeyText Data File
KUMAC	Physics Analysis Workstation Macro File
KWD	KWord File (KOffice format)
KYB	Keyboard Layout
KYE	Kye game data
KYE	Kye Game Data
KYF	Visual-Voice Mouth Movement File
L	Cliq Accessories Datebook Lock File
L	LEX Program File
L	Link Instructions
L	LISP Program File
LA	Lightscape Animation
LAB	Mailing Labels
LAB	NCSS Data File
LAD	Daylon Leveller Animation Data
LAN	ERDAS IMAGINE LAN Sensor Data
LAR	Liquid Audio Player Registration File
LAT	Crossword Express Lattice File
LAV	Liquid Audio Player Voucher File
LAVS	Liquid Audio Player Streaming Voucher File
LAY	Applause Word Chart Layout
LAY	Lightscape Layer State
LAY	Track Builder Simulation Compiler Code (Railroad centralized traffic control simulations)
LBA	Liberty BASIC File
LBG	dBase IV Label Generator
LBI	Dreamweaver Library File
LBK	VersaPro Local Logic Block Backup
LBL	Labels (various)
LBM	Deluxe Paint Bitmap Graphic
LBM	XLib Linear Bitmap Graphic
LBO	dBase IV Ordered Labels
LBR	Compressed Archive File
LBR	Lotus 1-2-3 Display Driver
LBR	Omnis7 Application File
LBS	Omnis Studio Application File
LBT	Label Memo (used by MS Visual FoxProÊ6)
LBX	Label (used by MS Visual FoxProÊ6)
LBXADD	Libronix DLS Addin
LBXALV	Logos Bible Software Series X Passage In All Versions
LBXCBV	Logos Bible Software Series X Copy Bible Verses Style
LBXCIT	Libronix DLS Citation Format
LBXCMP	Libronix DLS Company Information
LBXCOL	Libronix DLS Resource Collection
LBXCTB	Libronix DLS Custom Toolbar
LBXDAT	Libronix DLS Data File
LBXDTP	Libronix DLS Data Type
LBXLBK	Libronix DLS License Backup
LBXLIC	Libronix DLS Licenses File
LBXLLS	Libronix DLS Resource (LLS Format)
LBXNOT	Libronix DLS Notes
LBXOEB	Libronix DLS Resource (OEB Format)
LBXPDF	Libronix DLS Resource (PDF Format)
LBXPLN	Logos Bible Software Series X Bible Reading Plan
LBXPLV	Logos Bible Software Series X Parallel Bible Versions
LBXPRF	Libronix DLS Preferences
LBXRAS	Libronix DLS Resource Association
LBXRTP	Libronix DLS Resource Type
LBXSHL	Libronix DLS Shell
LBXUPD	Libronix DLS Update Script
LBXVRS	Logos Bible Software Series X Verse List
LBXWKS	Libronix DLS Workspace
LBZ	Leibniz Mathematical Word Processor
LCD	CDspace CD Emulator
LCF	Linker Control File
LCH	PagePath Technologies LAUNCH! File
LCK	Adobe PageMaker Database File
LCK	MS Frontpage-related File
LCK	Paradox Lock File
LCL	FTP Software Data
LCN	WordPerfect Dictionary File
LCS	ACT! History File
LCW	Lucid 3-D Spreadsheet
LD	Telix Long Distance Codes
LD1	dBase Overlay File
LDB	MS Access Lock File
LDB	Settler for Windows Temporary File
LDB	TrueVector Log Database
LDD	Laser Dispatch Data
LDF	Geoworks Glue Library Definition
LDF	LuraDocument File
LDF	MS SQL Server Transaction Log File
LDL	Corel Paradox Delivered Library
LDL	OzWin CompuServe E-mail/Forum Access Download Request
LDR	LDraw Model File
LDS	Laser Dispatch Script
LDS	Trane Trace Load
LEG	Legacy Graphic Format
LEP	Label and Envelope Designer Plus 2000
LES	Learn Lesson File
LES	Logitech Entertainment system game profiles (same as REG file)
LES	Mklesson Lesson File
LET	Letter
LEV	NetHack Level File
LEV	Worms Armageddon Map
LEV	Worms World Party Map
LEX	Lexicon (dictionary file)
LFA	LifeForm File
LFL	LucasFilm Library
LFM	LifeForm File
LFP	LifeForm File
LFQ	LeechFTP Queue File
LFT	3D Studio Loft File
LFT	Chiwriter Laser Printer Font
LFXM	FaceMail Text to Speech E-mail
LG	Logo Procedure Definition
LGC	Program Use Log File (for Windows Program Use Optimization)
LGF	legal Eagle Text File
LGO	MS Windows Logo Driver
LGO	SuperFax Header/Footer Logo
LGP	Logotron SuperLogo File
LGT	The Sims (Maxis) Lighting File
LGT	Urban Chaos Game File
LGX	Openlgx, an open source flash tool (see www.openlgx.org)
LHA	Compressed Archive File (LZH)
LHS	Literate Haskell Source File
LHW	Compressed Amiga Archive File
LHZ	LHA Compressed Archive File
LIB	Greeting Card Library (e.g., KEY Greeting Card Designer)
LIB	Program Library (diverse programmers' languages)
LIB	Static-link library
LIC	License File (various Shareware)
LID	WinDVD File
LIF	Compressed Archive File
LIF	HP Logical Interchange Format File
LIM	Limit Compressed Archive
LIN	AutoCAD Line Art
LIN	VAX Program Listing
LIQ	CollegeBAR Bartending Software Liquor Cabinet
LIS	Output file produced by a Structured Query Reporting (SQR) program
LIS	VAX Program Listing
LIT	MS Reader EBook File
LIV	Adobe LiveMotion Source File
LIVESUBSCRIBE	Symantec Norton AntiVirus Update Catalog
LIVEUPDATE	Symantec Norton AntiVirus Update File
LIX	Extend Simulation Library File
LIX	Libronix DLS Resource (LLS 2.x Index)
LJ	Text File for HP LJ II Printer
LKO	MS Outlook Express Linked Object
LL3	LapLink III Document File
LLB	LabView File
LLC	LapLink Saved Connection File
LLP	Digital Chart of the World Data File
LLP	VersaPro Local Logic Block
LLT	Digital Chart of the World Data File
LLX	Laplink Exchange Agent
LM8	Picture File
LMD	Tune Smithy List of Modes for a Musical Scale
LMU	RPG Maker 2000 (map included in an RPG game)
LNB	Logomanager File
LND	3D Landscape Data
LNK	Linker File
LNK	Windows shortcut file
LNK	Windows Shortcut File
LNS	LinkStash Bookmark File
LOC	Suppose Locations File
LOD	Load File (various)
LOG	Log File (many different programs)
LOGONXP	LogonStudio File (customizes the WindowsXP Logon screen)
LOK	FileWrangler/ZipWrangler/SecurDesk! Encrypted Archive
LP	Lightscape Preparation File
LP	LP88 Linear Programming for the IBM-PC File
LP1	GIST - CDAC's iLeap Multilingual (Indian) Document VersionÊ1 (see www.cdac.org.in)
LP2	GIST - CDAC's iLeap Multilingual (Indian) Document VersionÊ2 (see www.cdac.org.in)
LPA	LPA-View Laser Particle Analyser Test Analysis Software
LPB	LP88 Linear Programming for the IBM-PC File
LPC	Teko Printer Driver
LPD	Avery Label Pro
LPD	Helix Nuts and Bolts File (Helix Software now part of McAfee)
LPI	Live Pictures
LQF	Leech FTP Save Queue File
LQP	Liquid Audio Player Passport File
LQT	Liquid Audio Player File
LQT	Winamp File
LRC	Intel Video Phone File
LRF	MS C/C++ Linker Response File
LRM	MS Encarta Class Server Learning Resource
LRS	Daylon Leveller Rendition Style (data used for visualizing heightfields)
LRS	WordPerfect Language Resource File
LS	Freeware Dictionary Project Data File
LS	Lightscape Solution File
LS1	OzWin CompuServe E-mail/Forum Access Library Listing
LSA	Liquid Audio Player Skin File
LSC	Tune Smithy List of Muscial Scales
LSE	Nokia Audio Manager
LSF	Libronix DLS Resource (LLS 2.x)
LSF	Streaming Audio/Video File
LSG	MS LocStudio Glossary
LSL	Corel Paradox Saved Library
LSL	Daylon Leveller Shape List (3D geometry for heightfield vector objects)
LSL	Lotus Script Library
LSO	Logic Audio File
LSP	LISP Program File
LSQ	CalTech PaleoMag Least Squares Format
LSQ	VAX CRYSTALS Chemical Crystallogaphy File
LSR	Logos Library System 2.x Standard Reference Definition
LSS	Legato Spreadsheet
LST	1st Reader Keyboard Macro
LST	Documenting Wizard list (used by MS Visual FoxProÊ6)
LST	Ingres Dump List File
LST	List File (various)
LST	MS PowerPoint File
LST	Oracle Spool File
LST	OzWin CompuServe E-mail/Forum Access Library Listing
LSX	Streaming Audio/Video Shortcut
LT2	Curious Labs Poser Lighting File
LTG	Lasertank Bitmap Graphics
LTH	Sierra Print Artist Letterhead
LTM	Lotus Form
LTR	Letter File
LTT	HP Library and Tape Tools Log File
LTT	SDR99 Speech Recognition Task Lexical TREC Transcription
LU	ThoughtWing Library Unit File
LUA	Lua Source
LUL	OzWin CompuServe E-mail/Forum Access Upload
LUP	OzWin CompuServe E-mail/Forum Access Library Update
LVL	Lasertank Level
LVL	Parallax Miner Descent/D2 Level Extension
LVP	Lucent Voice Player (Intuity Audix Multimedia Messaging System)
LVS	Daylon Leveller Selection Mask
LVW	Daylon Leveller View File
LW3	Lightwright File (spreadsheet/database to manage professional lighting design paperwork)
LWC	Living Word Commentaries Bible File
LWD	LotusWorks Text Document
LWF	LuraWave-compressed Graphic File
LWO	NewTek Lightwave Object File
LWP	Lotus Wordpro 96/97 File
LWS	NewTek Lightwave Object Layout
LWV	MS Linguistically Enhanced Sound File
LYR	DataCAD Layer File
LYT	SignMaking Application Extension
LYT	TurboTax Log File
LYX	Lyx Text Document (a LaTeX-compliant word processor)
LZD	Binary Difference File
LZH	LH ARC Compressed Archive
LZS	Compressed Archive File
LZS	Skyroads Data File
LZW	Compressed Amiga Archive File
LZX	Compressed File
M	Brief Macro Source
M	Cliq Accessories Datebook Modification File
M	Desktop Color Separation Specification Magenta Layer (usually an EPS file)
M	Either MATLAB functions or Mathematica (version>=3.0) packages
M	Limbo Interface Declaration (Inferno OS)
M	Mathematica File
M	Matlab Function
M??	Ingres Modify Table/Index File (?? = Hex 00 to FF)
M_U	MazeGold Critical File Backup
M11	MASS11 Text File
M12	Hydrographs Synthesis Project File
M12	Proprietary Data Format for Interchange of Defense Form Data with Mil-Pac Technology Software Products
M12	S-BASIC File
M15	Apple MPEG-1 Video
M18	Accolade Golf Course File
M1A	Apple MPEG-1/2 Audio
M1V	MPEG-1 Video File (MIME type 'mpeg')
M2A	Apple MPEG-1/2 Audio
M2P	MPEG-2 Program Stream Format File
M2S	MPEG-2 Audio and Video (system stream)
M2V	MPEG-2 Video Only File
M3	Modula 3 Program File
M3A	MPEG Archive Enhanced .M3U Playlist File
M3D	3D Animations Macro
M3D	Corel Motion 3D animation
M3D	Corel Motion 3D Animation
M3D	EverQuest File
M3S	Myst III Exile Saved Game
M3U	MP3 Playlist File
M3U	MPEG URL (MIME audio file)
M4	UNIX M4 Preprocessor File
M75	Apple MPEG-1 Video
M8	Heretic II Game File
MA	Maya File
MA	Old Mathematica (version < 3.0) notebooks
MA3	Harvard Macro (Harvard Graphics taken over by Serif)
MAC	MacPaint Bitmap Graphic
MAC	Macro (various)
MAD	Game Movie File
MAD	MS Access Module Shortcut
MAF	MS Access Form Shortcut
MAG	MPS Magro Paint System Graphic
MAG	MS Access Diagram Shortcut
MAI	VAX Mail
MAK	Make File (compiler project file)
MAK	Visual Basic or MS Visual C++ Project
MAM	MS Access Macro Shortcut
MAN	Manual File
MAP	AccView Network Map
MAP	Atlas MapMaker Map
MAP	Blood Game File Map
MAP	Color Palette
MAP	Duke Nukem 3D WAD Game File
MAP	Image File
MAP	Ingres Termcap Mapping File
MAP	Linker Map
MAP	Map File
MAP	Micrografx Picture Publisher Format Data
MAP	WorldCraft Quake/Half-Life Game Level File
MAQ	MS Access Query Shortcut
MAR	Bibliographic Data Format (usually .MRC)
MAR	MS Access Report Shortcut
MAR	VAX Macro Assembly Program
MAS	Focus Master Data Definition
MAS	Lotus Freelance Graphics Smartmaster File
MAS	MS Access Stored Procedures
MAS	QuickCard File
MAT	Autodesk 3D Studio Max and Viz File
MAT	Matlab Variables Binary File
MAT	MS Access Table Shortcut
MAT	Pro/Engineer Material Properties File
MAT	Sound File
MAUD	Sound File
MAV	MS Access View Shortcut
MAW	MS Access Data Access Page
MAX	Autodesk 3ds Max Scene File
MAX	Kinetix's 3D Studio MAX Scene
MAX	Max Source Code
MAX	Maximizer Contact & E-business Program
MAX	OrCAD Layout File
MAX	Paperport Scanned Image
MAZ	Division's dVS/dVISE File
MAZ	Hover Maze Data
MB	Maya Binary (3D Software Maya Scenes)
MB	Paradox Memo Holder
MB1	Apogee Monster Bash Data File
MBD	Multimedia Builder MP3 Authoring File
MBF	MS Money Backup File
MBK	dBase IV Multiple Index Backup
MBK	VersaPro Motion Block Backup
MBM	SymbianOS Multi BitMap Image (native EPOC image format)
MBT	ecBuilder Template (Web site cataloging)
MBX	Mailbox Message File (Outlook v1-4 or Eudora and others)
MC	MetaCard Script
MC8	Mastercam 8 File
MCA	i-deas Web ACCESS File
MCC	Dialer10 Calling Card
MCC	Incite Media Assistant File
MCC	Mathcad Configuration
MCC	Monu-Cad Pro CAD File
MCC	Mylar City Character Editor
MCD	Craig McDowall.com NotePad
MCD	Mathcad Document
MCD	Monu-Cad Pro CAD File
MCF	Master Command File
MCF	Mathcad Font
MCF	Meta Content Format File (describes a Web site)
MCF	TMPGEnc Template (Multimedia Container Format File)
MCI	MCI command set
MCI	Media Control Interface Command Set
MCL	Macro Command Language (Symbol handheld terminals)
MCL	Multimedia Manager Collection File
MCP	Capsule Application Script
MCP	Mathcad Printer Driver
MCR	DataCAD Keyboard Macro File
MCS	MathCAD Format File
MCT	Musicator
MCW	MacWrite II MacÊOS Text File
MCW	MS Word for Mac OS Document
MCX	Graphic File
MD	Compressed Archive File
MD	Teknical eLearning Objects Meta-Data File (stores info on related file)
MD1	Gear CD Suite File
MD5	MD5summer (generates and verifies md5 checksums, also see www.irnis.net)
MDA	MS Access Add-in/Workgroup
MDB	File Viewer Extension
MDB	Mediator Multimedia Data
MDB	MS Access Application/Database
MDE	MS Access Database File
MDF	Accelio Capture Classic (JetForm) Filler (JetForm Corp became Accelio 12 Sep 2001)
MDF	Menu Definition File
MDF	MS-SQL Master Database File
MDF	Trados MultiTerm filter definition file
MDF	Trados Workbench translation memory system file
MDL	3D Design Plus Model
MDL	CA-Compete! Spreadsheet
MDL	Digital Tracker music module (MOD) file
MDL	Quake Model File
MDL	Rational Rose Model
MDL	Simulink Simulation Model
MDL	Trados MultiTerm layout definition file
MDM	Telix Modem Definition
MDMP	WinXP Trouble Report (extension is added to file sent)
MDN	MS Access Blank Database Template
MDP	MS Developer Studio Project
MDR	FaxTalk Modem Doctor Modem Report File
MDs	Media Descriptor Image files (Image of a CD)
MDT	MS Access Add-in Data
MDT	MS ILink Incremental Linker Data Table
MDW	MS Access Workgroup Information
MDX	Avery Label Pro Re-Index File
MDX	dBase IV Multiple Index
MDX	Trados MultiTerm export definition file
MDZ	MS Access Wizard Template
ME	Information (e.g., READ.ME -- usually a text file)
MEA	Meazure File (screen measurement and capture utility)
MEB	WordPerfect Macro Editor Bottom Overflow File
MED	Music Editor, OctaMED music module (MOD) file
MED	OctaMED Tracker Module
MED	WordPerfect Macro Editor Delete Save
MEL	Ericsson Phone Melody
MEM	Memory File of Variables
MEM	Variable save (used by MS Visual FoxProÊ6)
MEM	WordPerfect Macro Editor Macro
MEN	Menu File
MEQ	WordPerfect Macro Editor Print Queue
MER	Data Interchange Format
MER	Format for interchanging spreadsheet/database data; recognized by Filemaker, Excel, and others
MER	WordPerfect Macro Editor Resident Area
MES	Message File
MES	WordPerfect Macro Editor Work Space
MET	OmniPage Document
MET	Presentation Manager Metafile
MET	WordPerfect Macro Editor Top Overflow File
MEU	DOS Shell Menus
MEX	Matlab Executable Command
MEX	mexReader Multimedia File
MEX	WordPerfect Macro Editor Expound File
MEZ	RealArcade Game Information
MF	MetaFont Text File
MFA	MS Site Server 3.0 Report Definition
MFF	MIDI File Format
MGC	MGCSoft Equation Editor File
MGF	Image File
MGF	Materials and Geometry Format File
MGF	Micrografx Font
MGL	MosASCII Graphics Library
MGM	MGCSoft Equation Editor Macro File
MGX	Micrografx Picture Publisher Clipart
MGZ	Metal Gear Solid Archive
MH	Graphic File
MHG	Multimedia File
MHK	Riven Movie Data File (Mohawk Archive)
MHP	MS Home Publishing Project
MHT	MS MHTML Document (Archived Web Page)
MHTM	MHTML document (MIME)
MHTML	MHTML document (MIME)
MI	CoCreate CAD File
MI	Miscellaneous File
MIB	Management Information Base File (SNMP Management Programs)
MIC	MS Image Composer File
MID	MIDI Music Sequence File
MIF	Adobe FrameMaker Interchange Format
MIF	MapInfo Interchange Format File
MIF	MicroHof .MIF Assembler File
MIF	MIDI Instrument File
MIF	Software License Tracking Tool (CERTAUTH.MIF)
MII	MicroStat II Data File
MIL	Group 4 Fax File
MIM	Multi-Purpose Internet Mail Extensions (MIME) File
MIO	mexReader Multimedia File
MIP	Paint Shop Pro Multiple Image Print File
MIS	Delta Force Land Warrior Mission
MIS	MagicInstall Installation Script
MIS	Tribes 2 Game File
MIX	Command & Conquer Movie/Sound File
MIX	MS PhotoDraw 2000 picture format
MIX	Multilayer Picture File (MS PhotoDraw 2000 & MS Picture It!)
MIX	OzWin CompuServe E-mail/Forum Access Index File
MIX	Power C Object File
MIX	Techno eJay Music Mix File
MJ	MovieJack DVD Ripper File
MK	Make File
MKD	Malz++Kassner CAD5 Drawing
MKE	Make File
MKI	Picture File
MKL	Malz++Kassner CAD5 Drawing Library
MKS	Tact Data
ML3	Milestones 3.x Project
MLB	Macro Library
MLD	Multilizer Dictionary
MLI	3D Studio's Material-Library File
MLI	Encyclopedia Media List
MLK	Sierra Mastercook File
MLM	Novel Groupwise E-mail File
MLS	Miles Sound Tools Compressed DLS
MM	Lightscape Material Map
MM	Macro Mania Macro
MM	Multimate Advantage File
MMB	MultiMedia Builder
MMC	Media Catalog
MMC	MS Office XP Media Content
MME	Multi-Purpose Internet Mail Extensions (MIME) File
MMF	Meal Master Format
MMF	MS Mail Message File
MMI	Memo Open Client
MML	Mail Meta Language
MMM	MacroMind Directory RIFF/RMMP Format Movie
MMM	MS Multimedia Movie
MMO	RapidFile Memo Writer
MMP	Bravado Board Video Output Format
MMP	Gammadyne Mailer Project File
MMP	MindManager Map File
MMPBT	MindManager Branch Template File
MMPT	MindManager Template
MMS	Miles Sound Tools (Midi+DLS/MLS)
MMSCRIPT	MindManager Script File
MMT	Nimbus 7 SAMS Data File (Monthly Mean retrieved Temperatures)
MMW	MS Media Content
MMX	Command & Conquer Red Alert 2 Map File
MMZ	MusicMatch Theme File
MN2	Descent2 Mission File
MN3	Descent3 Mission File
MN4	MS Money Database (older version)
MNC	My Notes Center File
MND	AutoCAD Menu Program File
MND	MNI Mandelbrot for Windows
MNG	Animation Shop Animation
MNG	DeLorme Map'n'Go Map
MNG	Multi-image Network Graphic
MNO	Monopoly Saved Game
MNR	AutoCAD Compiled Menu File
MNS	AutoCAD ASCII Menu File
MNT	Foxpro Menu Memo
MNT	Menu memo (used by MS Visual FoxProÊ6)
MNU	HP NewWave Advanced Macro
MNU	Menu File (various)
MNW	Menu File (various)
MNX	AutoCAD Compiled Menu File
MNX	Menu (used by MS Visual FoxProÊ6)
MNY	MS Money File
MOB	Device Definitions
MOD	Amiga and PC Tracker Module
MOD	FastTracker, StarTrekker, Noise Tracker (etc.) music module file
MOD	Model File (various)
MOD	Modula-2 Program File
MOD	MS Multiplan Spreadsheet
MOD	Music File (various)
MOD	ProModel Optimization Software Suite Model
MOD	Windows Kernel Module
MODEL	Catia File
MOL	MDL Molfile (MIME type chemical/x-mdl-molfile)
MON	ReadMail Monitor (UNIX)
MOP	Mopac Input File (MIME type chemical/x-mopac-input)
MOV	Apple QuickTime Audio
MOV	AutoCAD AutoFlix Movie
MOV	QuickTime Movie/Video Clip
MOVERADDIN	Mover (Inventory Management) Add-in
MOVERBACKUP	Mover (Inventory Management) Backup Set
MOVERCONFIG	Mover (Inventory Management) Configuration
MOVERDB	Mover (Inventory Management) Database
MOVERREG	Mover (Inventory Management) Registration Info
MOVERTEMPLATE	Mover (Inventory Management) Template
MOX	Extend Simulation Model File
MOZ	Netscape Temp File
MP	Multiplan File
MP+	MpegPlus Audio File (replaced by .MPC)
MP1	MPEG Audio Stream, Layer I
MP2	MPEG Audio Stream, Layer II (MIME video file)
MP3	MPEG Audio Stream, Layer III
MP4	iVAST MPEG-4 (hold BIFS-Binary Information For Scene representation)
MPA	MPEG Audio Stream, Layer I, II or III
MPA	MPEG-related file (MIME type 'mpeg')
MPA	Palm Memo File
MPC	MP3 Collector Collection Manager File
MPC	MS Project Calender
MPC	Musepack Audio File (new format replacing .MP+)
MPC	VersaPro Compiled Motion Block
MPD	Mini Port Driver
MPD	MS Project Database File
MPDEX	MPdex MP3 Database Utility
MPE	MPEG Movie Clip
MPE.EXE	MP3 Digital Player Wrapper
MPEG	MPEG Movie
MPF	MosASCII Project Workspace File
MPF	MS Design Gallery
MPG	MPEG Movie
MPG	MPEG-1 System Stream
MPGA	MPEG-1 Layer3 Audio Stream
MPH	MS Publisher
MPJ	Mountain Video Editing File (Atari)
MPJ	RoboHTML Project
MPK	Augmented MS-Project File
MPM	WordPerfect MathPlan Macro
MPO	Augmented MS-Project File
MPP	CAD Drawing File
MPP	MS Project File
MPQ	Blizzard Game Data File
MPR	Generated menu program (used by MS Visual FoxProÊ6)
MPS	Casio PDL Pocket Streets Map
MPS	Garmin Mapsource GPS Mapping Interface
MPS	Magix Music Studio File
MPS	Max Payne Saved Game
MPS	MPEG-1 Audio and Video File (system stream)
MPS	Multimedia File
MPT	MS Project Template File
MPT	Multipage TIFF Bitmap
MPV	MPEG-1 Video File
MPV	MS Project View
MPW	MosASCII Project Workspace File
MPX	Compiled menu program (used by MS Visual FoxProÊ6)
MPX	MS Project Export File
MRB	MS C++ Multiple Resolution Bitmap Graphic
MRC	Bibliographic Data Format
MRC	MIRC Script File
MRI	MRI Scan
MRK	Informative Graphics Markup File
MRS	WordPerfect Macro Resource File
MS	Checksum File for Anti-Virus
MS1	OzWin CompuServe E-mail/Forum Access Message File
MSA	Magic Shadow Archive
MSC	MS C Makefile
MSC	MS Common Console Document
MSF	Multiple Sequence File
MSG	MS Exchange Mail Document
MSG	MS Mail Message
MSG	OzWin CompuServe E-mail/Forum Access Message File
MSG	Program Message
MSH	MASH (The MS Agent Scripting Helper)
MSI	Windows Installer File
MSK	Autodesk Mask File
MSK	PaintShop Pro Mask File
MSN	Descent Mission File
MSN	MS Network Document
MSO	Math Script Object File
MSO	MS FrontPage File
MSO	MS Word OLE Web Page Storage Stream
MSP	MS Paint Graphic File
MSP	Windows Installer Patch
MSP	Windows Paintbrush picture
MSR	OzWin CompuServe E-mail/Forum Access SYSOP File
MSRCINCIDENT	MS Remote Assistance Request
MSS	Game Score
MSS	Manuscript Text File (various)
MST	ChemFinder Chemical Structure Index
MST	DATAIR Pension System Master File
MST	Mini Specification
MST	Visual Test Source File
MST	Windows SDK Setup Script
MSV	Sony Memory Stick Format
MSW	MS Word Text File
MSWMM	MS Windows Movie Maker Project (Part of WinME & XP)
MSX	Compressed CP/M File Archive
MTF	Darkstone Archive
MTF	Trados Workbench translation memory system file
MTH	Derive Math File
MTK	Matrikon Software License File
MTM	MultiTracker Music Module (MOD) File
MTP	L&H Power Translator Pro
MTV	Picture File
MTW	Minitab Data File
MTW	Trados MultiTerm termbase
MTX	Temporary File often used by a browser or TWAIN device
MU	Quattro Menu
MUC	Music Collector Collection Manager File
MUF	ProtoMuck Multi User Forth Program
MUL	Ultima Online Game
MUP	Music Publisher File
MUS	Finale Music Score
MUS	Harmony Assistant, Melody Assistant, Myriad Music plug-in, Melody Player
MUS	MusicTime Audio File
MVB	Database File
MVB	MS Multimedia Viewer File
MVC	Music Collector Collection Manager File
MVE	Interplay Video File
MVF	Movie Stop Frame File
MVI	AutoCAD Movie Command File
MVW	Saber LAN Log File
MW4	MechWarrior 4 Map
MWF	Autodesk MapGuide Author Map Window File
MWF	ProMotion Animation
MWF	Trados Workbench translation memory system file
MWP	Lotus Wordpro 97 Smartmaster File
MWP	MegaWorks Pack File
MWS	Maple Spreadsheet
MXD	GIS Project File (map information)
MXM	MS Project/Outlook Team Assign Task
MXP	ArcReader Published Map
MXP	Macromedia Extension Manager
MXT	ArcMap Map Template
MXT	MS C
MYP	Make Your Point Presentation
MYS	Myst Saved Game
MYW	MyWorld Education Drawing
MZ	MOZART Music Document
MZT	MOZART Template File
N1E	OM2 OMALI NENA Encrypted Document Version 1
N2E	OM2 OMALI NENA Encrypted Document Version 2
N3E	OM2 OMALI NENA Encrypted Document Version 3
N4E	OM2 OMALI NENA Encrypted Document Version 4
N64	MiMiX Emulator
N64	Nintento 64 Emulation ROM Image
NA2	Netscape Communicator Address Book
NAB	Netscape Communicator Address Book
NAB	Novell Groupwise Address Book
NAD	Noder File
NAI	WinINSTALL File
NAM	MS Office Name File (often DISPLAY.NAM - text description)
NAN	Nanoscope File
NAP	EnerGraphics VideoShow File
NAP	NAP Metafile (vector image)
NAP	Napster Music Security Definition File
NASB	TheWord & Bible Companion New American Standard Bible
NAV	MSN Application Extension
NB	Mathematica (version>=3.0) Notebook
NB	Nota Bene Text File
NC	Graphics File
NC	Numerical Control Machine Instructions
NCB	MS Developer Studio File
NCC	Computer Numeric Control File
NCD	Norton Change Directory
NCD	NTI CD-Maker File
NCF	Lotus Notes Internal Clipboard
NCF	Netware Command File
NCH	On Hold Message/Music File
NCH	Outlook Express Folder File
NDB	Intellicom Network Database
NDL	Lotus Notes
NDO	3D Low-polygon Modeler
NDX	Index (usually dBase compatible)
NE1	OM2 OMALI NENA Document Version 1
NE2	OM2 OMALI NENA Document Version 2
NE3	OM2 OMALI NENA Document Version 3
NE4	OM2 OMALI NENA Document Version 4
NEB	Nortec H.E.L.P. (humidity calculations)
NED	MSN Application Extension
NEF	Raw Graphic File Format for Nikon Digital SLR Cameras
NEO	Atari Raster Graphics
NES	Nintendo Entertainment System ROM Image
NET	Network Configuration
NET	OrCad Netlist Output File
NEW	New Information (e.g., WHATS.NEW)
NFF	Image File
NFF	Neutral File Format
NFO	Folio Infobase
NFO	Folio Views
NFO	MS System Info File (XML format)
NFO	Text File
NFO	Warez Group Info File
NG	Norton Guide Online Documentation
NGS	NGSSniff File
NH	NetHack Defaults File (defaults.nh and/or NHAccess.nh)
NHF	Nero HFS-CD Compilation
NICK	Office Data File
NIF	NetImmerse File Format
NIL	Norton Icon Library File
NIV	TheWord & Bible Companion New International Version Bible
NJX	NJStar Document
NKJV	TheWord & Bible Companion New King James Version Bible
NLB	Oracle 7 Data
NLM	LogoManager for Nokia Phones (format for Nokia phone images)
NLM	Netware Loadable Module
NLS	Code Page National Language Support
NLS	Natural language services driver
NLTRACK	NoLimits Rollercoaster Simulator Track File
NLU	Norton Live Update E-Mail Trigger File
NLX	FormWorx Form
NMD	SwordSearcher File
NMI	SwordSearcher File
NMS	Numega Softice's Loader File (includes debugging info)
NNB	newnovelist Story Outline
NOB	Vampire: La Mascarade Archive
NOB	VersaPro Word Exchange File
NOD	NetObject Fusion Site
NOD	Noder File
NOL	Nokia Operator Logo
NON	Star Wars - Tie Fighter Mouse Options
NOT	ActiveNote Post-It-Notes
NOW	Text File (e.g., README.NOW)
NP	Cliq Accessories Notepad Text
NP	Nokia Planner Project Schedule
NPD	Noder File
NPI	dBASE Application Generator Source
NPL	DART Pro 98 Noiseprint Info
NPM	Nokia Picture Message
NPT	DART Pro 98 Noiseprint Archive Import
NRA	Nero Audio-CD Compilation
NRB	Nero CD-ROM Boot Compilation
NRG	IsoBuster File
NRG	Nero CD-Image
NRG	Norton Registration Entries
NRH	Nero Hybrid CD-ROM Compilation
NRI	Nero ISO CD-ROM Compilation
NRL	iManage File
NRM	Nero Mixed-Mode-CD Compilation
NRSV	TheWord & Bible Companion New Revised Standard Version Bible
NRT	Nokia RingTone
NRU	Nero UDF/ISO CD-ROM Compilation
NRV	Nero Video-CD Compilation
NS2	Lotus Notes 2 Database
NS3	Lotus Notes 3 ODS (On Disk Structure)
NS4	Lotus Notes 4 ODS (On Disk Structure)
NS4	Lotus Notes Database
NS5	Lotus Notes Domino File
NSC	Noder File
NSC	Windows Media Station File (used to gather info for WMP to play content)
NSF	Lotus Notes Database
NSF	NES Sound File
NSG	Lotus Notes
NSH	Large file format for Lotus Notes 2
NSI	Nullsoft Install System Script
NSO	NetStudio Easy Web Graphics File
NSP	Multi-Speech Sound File
NST	Noise Tracker Music Module (MOD) File
NSX	HiPer-Six Index File
NT	Windows NT Startup File
NTF	Lotus Notes Database Template
NTO	NTOScanner (TCP port scanner)
NTP	Neato CD Labels
NTR	Netrun Executable Text File
NTS	Netsend Executable Text File
NTS	Norton Tutorial
NTX	CARIS Marine Navigation Info
NTX	Clipper Index
NTX	Network Terminal Accelerator Adapter Card Configuration Information
NTX	Web Audio File
NUF	Procomm Plus New User Message
NUL	Grand Theft Auto (Playstation 2) Game File
NV	Juno Access Number Info File
NVF	Creative Nomad II Voice File
NW	NoteWorthy 2 File
NWC	Noteworthy Composer Song File
NWS	MS Outlook Express News Message (MIME RFC822)
NWS	Newsmaster or Newsmaster II Data File
NXT	NeXT Sound File
O	Object File (various)
O$$	Output File (temporary usually)
O01	Typhoon Voice File
OAB	MS Outlook Address Book
OAZ	OAZ Fax File
OB	IMB LinkWay Object File
OB1	OzWin CompuServe E-mail/Forum Access Saved Outbox File
OBD	MS Office Binder Template
OBE	MS Out of Box Experience File
OBJ	Lightwave Object
OBJ	Object file
OBJ	Relocatable Object Code (various)
OBN	Oberon-2 Module Source File
OBPACK	ObjectBar Object (customizes the Windows Taskbar)
OBR	Borland C++ Object Browser Data File
OBS	ObjectScript Script
OBS	OzWin CompuServe E-mail/Forum Access Saved Outbox File
OBT	MS Office Binder Template
OBTHEME	ObjectBar Theme File (customizes the Windows Taskbar)
OBV	ObjectScript Visual Interface
OBZ	MS Office Binder Wizard
OCA	Control Typelib Cache
OCF	Object Craft File
OCF	OM2Cipher File
OCM	AOL Advertising Control Files (advert.ocm & admin.ocm)
OCM	Internet Odyssey 2 Update
OCR	FAXGrapper FAX Text File
OCT	Radiance Octree Format
OCX	MS Object Linking and Embedding (OLE) Custom Control Extension (ActiveX)
OD1	Omnis5 Database File (also .OD2, .OD3, etc.)
ODE	MS Office Object Data Embedding File
ODF	BattleZone Cartographers Guild File
ODF	Open Document Interchange
ODL	Visual C++ Type Library Source
ODS	MS Outlook Express Mailbox
OEM	OEM Data Used During Device Install (various)
OEM	Text Listing of Supported OEM Devices for WinNT (TXTSETUP.OEM)
OF	LessDATA Video System OneFile File (contains both video and/or audio)
OFC	Open Financial Connectivity File
OFD	ObjectView Form Defintion 
OFF	3D Mesh Object File Format (vector graphic)
OFM	Adobe Font
OFM	OmniForm Form File
OFN	MS Office FileNew File
OFT	MS Outlook Item Template
OFT	MS Outlook template
OFX	Open Financial Exchange File (used by programs like Quicken)
OGG	Ogg Vorbis Codec Compressed WAV File
OGG	Origin File
OGS	Origin File
OIF	QuickBase Web-sharable Database Interchange File
OKS	OKScript File (Windows scripting tool)
OKT	Oktalyzer Music Module (MOD) File
OLB	OLE Object Library
OLD	Old Version (sometimes used as a backup indicator)
OLE	Object Linking and Embedding (OLE) Object
OLI	Olivetti Text File
OMF	Image File
OMS	MacÊOS MP3 Music Format
OMS	Omega Downloader Configuration File (text)
OND	Lotus Notes-related File (unverified)
ONX	Onyx Graphics Postershop File
OOM	Shroom Swap File
OP2	Outpost 2 Saved Game
OPC	Beta 44 Job File
OPF	Flip Album File
OPJ	OrCad Project File
OPJ	Origin File
OPL	Psion Organiser Programming Language Source File
OPN	Exact Active Options
OPO	OPL Output Executable File
OPT	MS Developer Studio File
OPT	Options
OPT	QEMM Optimize
OPX	Exact Inactive Options
OPX	MS Orgchart Organization Diagram
OPX	OPL Extension DLL
OQY	MS Excel OLAP Query File
OR2	Lotus Organiser 2 File
OR3	Lotus Organiser 97 File
OR5	Lotus Organiser File
OR6	Lotus Organiser File
ORA	Oracle 7 Configuration
ORC	MIDI File
ORC	Oracle 7 Script
ORG	Lotus Organiser File
ORG	Origin File
ORI	Original
OSC	Remote Installation Services Client Installation Wizard File
   (OSChooser Markup Language - MS KnowledgeBase Article Q268325)
OSS	MS Office Saved Search File
OST	MS Exchange/Outlook Offline File
OTB	Nokia Phone Graphics Editor
OTF	Open Type Font Format
OTL	Super NoteTab Template File
OTL	Z-Soft Type Foundry Font
OTP	Origin File
OTP	Top Secret Crypto File
OTS	OtsJuke Sound File
OTX	Olivetti Olitext Plus File
OU!	OzWin CompuServe E-mail/Forum Access Outbound Messages Online
OUT	Outlines or Output File (various)
OUT	OzWin CompuServe E-mail/Forum Access Outbound Messages
OV1	Program File - Overlay
OV2	Program File - Overlay
OV3	Program File - Overlay
OVA	Sierra Web Studio Graphic
OVD	ObjectVision Datafile
OVE	Cakewalk Overture Score
OVL	Program File - Overlay
OVR	Program File - Overlay
OZM	Sharp Organizer Memo Bank
OZP	Sharp Organizer Telephone Bank
P	Applause Picture
P	Cliq Accessories Datebook Permissions
P	PASCAL Program File
P	Progress 4GL Program
P	ReaGeniX Code Generator Application Parameter File
P01	IsoBuster File (P01, .P02, ... particularly in binary newsgroups (See .PAR below)
P10	Certificate Request
P10	Tektronix Plot 10 Drawing
P16	ProTracker Studio Music
P22	Patch22 Patch File
P65	Adobe PageMaker 6.5 Document File
P7C	Digital ID File (MIME)
P7M	PKCS #7 MIME Message (see Section 3.2 in RFC 2311)
P7R	Certificate Request Response
P7S	PKCS #7 Signature
PA	Print Artist
PA1	PageAhead Worktable
PAB	MS Exchange personal address book
PAB	MS Personal Address Book
PAC	Desperados: Wanted D|A Archive
PAC	SB Studio II Package
PAC	Stad Image
PAD	Scanner Output
PAD	Telemate Keypad Definition
PAD	Top Secret Crypto File
PAD	Visual Expert Source Code Documentation
PAF	PARIS Audio Format
PAF	Personal Ancestral File
PAG	Property Page File
PAK	Compressed Archive File
PAK	Dune 2 Archive
PAK	Final Fantasy 8
PAK	Half Life Archive
PAK	Hand of Fate Archive
PAK	Heretic 2 Archive
PAK	Hexen 2 Archive
PAK	Lands of Lore Archive
PAK	Quake Archive/WAD file
PAK	Trickstyle Archive
PAL	Adobe PageMaker Library Palette
PAL	Color Palette
PAL	Compressed File
PAL	Playstation Game
PAL	Tree Professional Palm Creator File
PAL	Windows Color Palette
PAN	Chromeleon Control Panel
PAN	CorelDraw Printer-specific File
PAN	Infinite Pictures, Inc. iMove Viewer
PAN	The Panorama Factory Project (versions lower than 2.0, higher use .PFP)
PAP	Tree Professional Palm Creator Image File
PAR	Atari Calamus-module/-driver Parameter file (LineArt)
PAR	Digitalk Parts Application
PAR	Fractint Parameter File
PAR	Mirror Archive Restoration File
PAR	Model Parameter File
PAR	Parity Volume Sets (.P01,...) (multiple programs)
PAR	SAP Enterprise Portal Component
PAR	SolidEdge 3D CAD Model
PAR	Windows 3.x Permanent Output File
PART	eDonkey 2000 Partial Download
PAS	Pascal Source Code
PAT	Advanced Gravis Ultrasound
PAT	AutoCAD Hatch Pattern
PAT	Corel Vector Pattern
PAT	DART Pro 98 Pattern
PAT	Forte Tech. Patch
PAT	Patch
PAU	OzWin CompuServe E-mail/Forum Access Paused Message
PAV	Panda Antivirus File
PAX	Project A.R.S.E Brain File
PAZ	Project A.R.S.E Brain File
PB	FAXability Fax
PB	PixBase Setup
PB	WinFax Pro Phone Book
PB1	First Publisher Document
PBA	Powerbasic Source Code
PBD	Faxit Phone Book
PBD	FaxNOW/Faxit Phone Book
PBD	PowerBuilder Dynamic Library
PBF	Grand Prix Legends BMAP (Bitmap) File
PBF	PBook E-book Format (renamed ZIP file)
PBF	Portable Bitmap Format File
PBF	Turtle Beach Pinnacle Bank File (multilayer sound file)
PBI	Powerbasic Include File
PBI	Profiler Binary Input
PBK	ElectraSoft Fax Phone Book
PBK	MS Phonebook
PBL	Powerbasic Library
PBL	PowerBuilder Library
PBL	Prebill extension for CMS
PBM	Portable Bitmap
PBM	UNIX Portable Bit Map Graphic
PBM	XLib Planar Bitmap
PBN	Portable Bridge Notation (stores deals for the card game bridge)
PBO	Operation Flashpoint Archive
PBO	Profiler Binary Output
PBR	BI/Suite Hypercube Presentation
PBR	PowerBuilder Resource
PBS	PowerArchiver Backup Script
PBT	Profiler Binary Table
PBX	MS Outlook Express Message Folder
PC	PC-specific Text File
PC	Sierra Print Artist Postcard
PC3	Harvard Custom Palette (Harvard Graphics taken over by Serif)
PC5	Rockwell Software Logix 5 File
PC8	ASCII Text IBM-8
PCA	PCAnywhere Registry Backup
PCA	Sonic Foundry Perfect Clarity Audio File
PCB	MS PowerPoint Application Data File
PCB	Protel Technology Advanced PCB Design
PCC	PC Paintbrush Image File
PCD	Kodak Photo-CD image
PCD	P-Code Compiled Test Scripts
PCD	Photo-CD Image
PCE	Eudora Mailbox Name Map
PCE	Print Shop Envelope
PCF	Profiler Command File
PCH	MS C PreCompiled Header
PCH	Patch File
PCJ	IBM Linkaway-Live Multimedia Tool Graphics
PCK	ARIA PIPP Spectrum
PCK	Turbo Pascal Pick File (may be found with many programs that use a pick file)
PCL	HP Laserjet bitmap
PCL	HP Printer Control Language
PCM	OKI MSM6376 Synth Chip PCM Format
PCM	Sound File
PCP	Symantec Live Update Pro File
PCS	PICS Animation
PCT	Honeywell GUS Display Builder
    - factory process overview -- an ActiveX container that runs from a viewer
PCT	Mac OS PICT Bitmap Graphic
PCW	PC Write Text File
PCX	PC Paintbrush Bitmap Graphic
PDA	Bitmap Graphic
PDB	Brookhaven Protein Databank File (MIME type chemical/x-pdb)
PDB	MS Visual Dev C++ Debugging Info
PDB	Palmpilot Database/Document File
PDB	Pegasus DataBase
PDB	QuickPOS Database File
PDB	Tact File
PDC	PowerDivX NextGen Media Player Chapter File
PDD	Adobe PhotoDeluxe Image
PDF	Adobe Acrobat Portable Document Format (also erringly referred to as "Portable Digital Format)
PDF	Analyser Protocol Definition File
PDF	Ed-Scan 24-bit Graphic File
PDF	MS Package Definition File (Inventory-related)
PDF	Netware Printer Definition File
PDF	Package Definition File from MS Systems Management Server
    - Verifies installed packages when performing an inventory scan of a client)
PDF	Printer Description File
PDG	PrintShop Deluxe File
PDI	MS Powerpoint File
PDL	Borland C++ Project Description Language
PDL	SymbianOS Printer Driver
PDM	PowerDivX NextGen Media Player
PDM	Sybase Power Designer File
PDN	Plan de Negocio
PDQ	Patton & Patton Flowcharting PDQ Lite File
PDR	Port or Printer Driver
PDR	SymbianOS Printer Resource File
PDS	Incredimail
PDS	Print Shop Graphic
PDS	Source Code File
PDS	Telsis HiCall Program File
PDT	ProCite Primary Database
PDT	VersaPro Compiled Block
PDV	Paintbrush Printer Driver
PDW	Professional Draw Document
PDX	Acrobat Catalog Index
PDX	Paradox Files
PDX	ProCite Database Keys
PE	PatentEase File
PE4	Photo Explorer Thumbnail
PEB	WordPerfect Program Editor Bottom Overflow File
PED	WordPerfect Program Editor Delete Save
PEM	WordPerfect Program Editor Macro
PEP	TurboProject Project File
PEQ	WordPerfect Program Editor Print Queue File
PER	WordPerfect Program Editor Resident Area
PES	WordPerfect Program Editor Work Space File
PET	Custom CD Menu
PET	Magic Petz File
PET	WordPerfect Program Editor Top Overflow File
PF	Aladdin Systems Private Files Encrypted File
PF	ICM profile
PF	Monitor or Printer Profile File
PF	Prefetch (also called Scenario) File
    - located in %windir%\prefetchfolder, contains info necessary to start applications faster.
PF	Progress Parameter File
PF	Quicktime File
PF?	SmartWare Project Source File (requires login)
PFA	Outline Font (ASCII)
PFA	Type 1 font (ASCII)
PFB	Outline Font (Binary)
PFB	Type 1 font (binary)
PFC	AOL Preferences
PFC	First Choice Text File
PFC	New Soft Presto! Page Manager File (product often ships with scanners)
PFC	PF Component
PFE	Programmers File Editor
PFF	Armored Fist 3 Archive
PFF	Delta Force Archive
PFF	Tachyon Archive
PFK	XTree Programmable Function Keys
PFL	SmartStation AppsView File
PFM	Printer Font Metrics
PFP	The Panorama Factory Project (versions 2.0 and above, lower use .PAN)
PFR	PaintShop Pro File
PFR	WebFont Wizard Portable Font Resource (no longer supported)
PFS	BIOCCELERATOR Homologous Sequence Names
PFS	PFS:File Database / PFS:Write Text
PFT	Chiwriter Printer Font
PG	IBM LinkWay Cut/Paste File
PGD	Pretty Good Privacy Virtual Disk File
PGI	PGraph Library Printer Device Driver
PGL	HP Plotter Drawing
PGM	Chromeleon Batch Program
PGM	Portable Graymap (bitmap) File
PGM	Signature Program
PGN	Portable Game Notation (Used for chess)
PGP	AutoCAD Keyboard Command Shortcuts
PGP	Pretty Good Privacy
PGP	Program Parameter
PGS	Man4DOS Manual Page
PGX	Binary Property Page File
PH	MS Help Compiler Phrase Table
PH	Optimized Geoworks .GOH File
PH	PERL Header
PHD	PC Help Desk File
PHN	UltraFax/QmodemPro Phone List
PHO	Metz Phone Phone List
PHP	MS Picture It! Publishing Project File
PHP	PHP Script (also .PHP3 & .PHP4)
PHR	LocoScript Phrases
PHR	NoExcuse Phrase Checker
PHS	PHScript File (document description script)
PHT	Partial Hypertext File (HTML fragments compiled into a whole)
PIC	Lotus Picture
PIC	Mac OS PICT File
PIC	PC Paint bitmap
PIC	PC Paint Bitmap Graphic
PIC	SDSC Image Tool Pixar Picture
PICT	Mac OS PICT image file
PIF	IBM PIF Drawing
PIF	MS-DOS/Windows Program Information File
PIG	Lucas Arts Dark Forces WAD File
PIM	PixMaker Project File
PIN	Compton's 3D World Atlas
PIN	Epic Pinball Data File
PIN	Links Games Player Information File
PIN	Pushpin Set
PIP	MS Office Personalized Menu and Toolbar
PIT	MacÊOS Compressed Archive File
PIX	Alias PIX Bitmap
PIX	Inset Systems Bitmap
PIX	PrintMaster Graphic File
PIX	SDSC Image Tool Alias Image
PJ	MKS Source Integrity File
PJ	SuperProject Project File
PJL	ProCite Term Lists and Journal Title Lists
PJT	AcuBench Project File
PJT	Project Memo File (used by MS Visual FoxProÊ6)
PJX	Foxpro Project
PJX	Project (used by MS Visual FoxProÊ6)
PK	CoolEdit96 Graphical Waveform
PK	TeX DVI Driver Packed Bitmap Font
PK3	American McGee Alice Archive
PK3	Heavy Metal: F.A.K.K.2 Archive
PK3	Quake 3 Arena Archive (renamed ZIP File)
PK3	Return to Castle Wolfenstein File
PKA	Compressed Archive File
PKB	QuickPOS (Point-Of-Sale) Keyboard Layout File
PKD	Top Secret Crypto File
PKG	AppleLink Package Compression Format File
PKG	MS Developer Studio Application Extension (similar to a DLL file)
PKG	Newton File/Application (Apple's old PDA)
PKG	Next Installer Script
PKO	PublicKey Security Object
PKR	PGP Public Keyring
PKR	Tony Hawk Pro Skater 2 Archive
PKT	Fidonet Packet
PL	Harvard Palette (Harvard Graphics taken over by Serif)
PL	Linux Shell Executable Binary
PL	Perl program
PL	PERL Program File
PL	PROLOG Program File (SWI-Prolog)
PL	TeX Property List Font Metric
PL1	3D Home Architect Room Plan
PL3	Harvard Chart Palette (Harvard Graphics taken over by Serif)
PLB	Foxpro Library
PLB	LogoShow Screensaver
PLC	Lotus Add-in
PLD	PINO 3
PLD	PLD2 Source File (program due out 1Q2001)
PLG	REND386/AVRIL File
PLI	Oracle 7 Data Description
PLL	Clipper Prelinked Library
PLM	DisorderTracker2 Module
PLM	Panasonic SD Voice Editor File
PLN	WordPerfect Spreadsheet File
PLR	Descent Pilot File
PLS	DisorderTracker2 Sample
PLS	MYOB Data File
PLS	Shoutcast File
PLS	WinAmp MPEG PlayList File
PLT	AutoCAD HPGL Vector Graphic Plotter File
PLT	Bentley's CAD MicroStation Driver Configuration for Plotting
PLT	Clipper 5 Pre-linked Transfer File
PLT	Gerber Sign-making Software File
PLT	HP Graphics Language (HPGL Plotter drawing)
PLT	Palette File
PLT	X-wing vs. Tie Fighter Pilot File
PLW	PicoLog Data File
PLX	Executable Perl Script
PLY	Autodesk Polygon
PLY	Blaze Media Pro File (multimedia software)
PLY	Harvard Spotlight Presentation Screen
PLY	PopMail Data
PM	Perl Module
PM	Presentation Manager Graphic
PM3	Aldus PageMaker 3 Document
PM4	Adobe PageMaker 4 Document
PM5	Adobe PageMaker 5 Document
PM6	Adobe PageMaker 6 Document
PMC	A4Tech Scanner Graphic
PMC	Windows Performance Monitor Settings
PMD	Adobe PageMaker File
PME	Plazmic Media Engine File
PMF	ArcReader GIS Mapping File
PMG	Adobe PageMaker Group File (EPS graphic)
PMI	Pegasus Mail Message Folder Index File
PML	NT4 Performance Monitor Log File
PML	PADGen Program Information
PML	Pegasus Mail Distribution List
PMM	Amaris BTX/2 Program
PMM	Pegasus Mail Mail Message Folder
PMO	Print Master Gold Text
PMP	Acdsee 3.0 Image (old compressed Sony format)
PN3	Harvard Printer Driver (Harvard Graphics taken over by Serif)
PND	DATAIR Pension System Pending File
PNF	Precompiled Setup Information (Temporary file seen during installs)
PNG	Fireworks Image File
PNG	Paint Shop Pro Browser catalogue
PNG	Portable (Public) Network Graphic (proposed GIF replacement)
PNG	Portable Network Graphics bitmap
PNL	PEERNET Label Designer File
PNM	PBM Portable Any Map Graphic
PNR	PEERNET Label Designer File
PNS	PEERNET Label Designer File
PNT	MacPaint File
PNT	MarkMail Qwk Reader Pointers
PNT	Paperport Thumbsview
PNT	World Data Bank II Country Data File (derived from CIA data)
PNTG	Same as PNT file
PNU	PEERNET Label Designer File
POC	PocoScript File
POD	Terminal Velocity Archive
POG	Descent2 File
POH	Optimized Geoworks .GOH File
POL	AscToHTM Policy File
POL	Music File
POL	Windows Policy File
POLICY	Java Policy File
POO	Poo Patrol Game File
POP	dBase Popup Menu
POP	PopMail Message Index
POS	ProCite Output Styles
POS	QuickPOS IIF File (see IIF above)
POT	MS PowerPoint Template
POV	Persistence of Vision Ray-tracer
POW	PowerChords Chord Chart
PP	Compressed Amiga Archive File
PP2	Curious Labs Poser Prop File
PP4	Picture Publisher 4 bitmap
PP5	Picture Publisher
PPA	MS PowerPoint Add-in
PPA	PowerPoint Add-in
PPB	WordPerfect Print Preview Button Bar
PPD	PostScript Printer Description File
PPF	Jasc Paint Shop Pro 7 Preset File
PPF	Micrografx Picture Publisher File (Micrografx now part of Corel)
PPF	PlayStation Patch File
PPF	Turtle Beach Pinnacle Program File
PPG	MS PowerPoint Ppresentation
PPG	Professor Franklin's Photo Print Gold
PPI	MS PowerPoint Graphics File
PPJ	Adobe Premiere Video Editing File
PPL	Harvard Polaroid Palette Plus ColorKey Driver (Harvard Graphics taken over by Serif)
PPM	PBM Portable Pixelmap Graphic
PPO	Clipper Preprocessor Output
PPP	Enfocus Preflight Profile
PPP	Parson Power Publisher
PPP	Serif PagePlus Publication
PPR	Cognos PowerPlay OLAP Multidimensional Cube
PPS	MS PowerPoint Slide Show
PPT	MS PowerPoint Presentation
PPX	Cognos PowerPlay OLAP Reporting
PPX	Serif PagePlus Publication
PPZ	PowerPoint Packaged Presentation
PQ	Adobe PageMaker Default Printer Style
PQA	Palm Query Application File (database for wireless access)
PQI	Power Quest Drive Imaging Software
PQX	Power Quest DRive Image Index
PR	EROSION 3D Precipitation Parameters
PR1	OzWin CompuServe E-mail/Forum Access Purged Message File
PR2	Aldus Persuasion Presentation
PR2	dBase IV Printer Driver
PR3	Aldus Persuasion Presentation
PR3	dBase IV PostScript Printer Driver
PRB	xyALGEBRA File
PRC	Palmpilot Resource File
PRD	Printer Driver
PRE	Lotus Freelance Presentation
PRE	MS Programmer's WorkBench Settings
PREFS	Preferences File (various)
PRF	dBase IV Printer Driver
PRF	Fastgraph Pixel Run Format Grahics
PRF	Macromedia Director settings file
PRF	PICS Rules File
PRF	Preferences File (various)
PRF	Profiler Output
PRF	Windows System File
PRG	Atari Program
PRG	Commodore 64 program
PRG	OzWin CompuServe E-mail/Forum Access Purged Message File
PRG	Program (used by MS Visual FoxProÊ6)
PRG	Program File (various)
PRG	WAVmaker Program
PRH	HitPlayer Advanced Playlist File
PRI	LocoScript Printer Definitions
PRJ	3D Studio File
PRJ	Project File (various)
PRK	CampgroundMaster/ResortMaster Database
PRK	Tony Hawk's Pro Skater 2 Saved Park
PRM	Parameter File
PRN	DataCAD Windows Printer File
PRN	HP Printer Control Language
PRN	PostScript File
PRN	Print Table (space delimited text)
PRN	Printer Text File (various)
PRN	XYWrite Printer Driver
PRO	Atari Calamus-module/-driver Protocol (TIFF-Spooler)
PRO	Creamware Pulsar Audio File
PRO	IDL Program File
PRO	Profile
PRO	PROLOG Program File
PRP	Palace Prop File
PRS	dBase Procedure
PRS	Harvard Graphics Presentation File (Harvard Graphics taken over by Serif)
PRS	Printer Resource File
PRS	WordPerfect Printer Resource Font File
PRT	Associated with the W32/Parrot-A worm:
    - particularly if found in the Windows directory along with .EXE files of the same root name
PRT	CADKEY Part File
PRT	Printer Configuration (various)
PRT	Printer Formatted File (result of Print to File option)
PRT	Pro/ENGINEER Model File
PRT	Pro/Engineer Part file
PRT	Unigraphics Part File (CAD modeling data)
PRV	Previous Version (used for files that change)
PRV	PsiMail Internet Provider Template
PRX	Foxpro Compiler Program
PRZ	Lotus Freelance Graphics 97 File
PS	PostScript File
PSB	Pinnacle Sound Bank
PSB	Project Scheduler Configuration File
PSD	Adobe Photoshop Document File
PSD	Apple Viewer File
PSD	DESIGN II for Windows General Flowsheet (Refining Process Simulation)
PSE	IBM Printer Page Segment Bitmap
PSF	Chiwriter PostScript Printer Font
PSF	PhotoStudio Graphic
PSI	PSION A-law Audio
PSM	Epic Games Sound Data
PSM	Protracker Studio Module Format
PSM	SolidEdge CAD File
PSM	Turbo Pascal Symbol Table
PSN	Post-it Software Notes
PSP	Paint Shop Pro Document File
PSP	Prodea Synergy Procedure
PSP	Project Scheduler Planning File
PSR	Project Scheduler Resource File
PSS	Sony Playstation Game File
PST	MS Exchange Personal Information Store
PST	MS Outlook Personal Folder File
PSW	WinXP Backup Password File
PSX	Dirty Little Helper Chat File
PSY	PLD2 System File
PSY	Psychedelic Windows Products
PT	Kodak Precision Transform
PT3	Adobe PageMaker Template
PT3	Harvard Device Driver (Harvard Graphics taken over by Serif)
PT4	Adobe PageMaker Template
PT5	Adobe PageMaker Template
PTB	Power Tab Guitar Tablature Editor
PTB	PubTach Batch Works Script
PTDB	Peachtree Accounting Database
PTI	IBM Configurator Configuration
PTM	MS MapPoint Map
PTM	PolyTracker Music Module (MOD) File
PTM	PubTech BatchWorks Macro
PTR	QMail Qwk Reader Pointer
PTS	Halflife Map Creation Debug File
PTS	Infinity Engine Game Tileset
PTT	MS MapPoint Template
PTX	E-Transcript of Court Proceedings
PUB	MS Publisher Document
PUB	PGP Public Key Ring
PUB	The Sims (Maxis) Family Data
PUB	Ventura Publisher Publication File
PUD	Warcraft II PUD Map
PUF	Puffer Encrypted File
PUT	Instalit Script
PUZ	Across Lite Crossword Puzzle
PVA	Hauppauge DVB-Software
PVL	Instalit Library
PVT	Local Fidonet Pointlist
PW	Professional Write Text File
PWA	Password Agent File
PWD	AutoCAD Password File (ACAD.PWD)Password Pro File
PWD	MS Pocket Word Document File
PWF	ProCite Workforms
PWL	Password List
PWP	Photoworks Image File
PWP	Professional WritePlus Document
PWZ	MS PowerPoint Wizard
PX	Paradox Primer Database Index
PX	Primary Index
PXA	Pixia Color Painter File
PXE	Partial XML Envelope
PXI	Pixie File (scalable vector images viewed with an applet)
PXL	MS Pocket Excel Spreadsheet File
PXN	PictureWorks PhotoEnhancer Graphic Image
PY	PYTHON Script
PY	Yahoo Saved Messages
PYC	Compiler PYTHON Script / Bite-Compiled PYTHON Code
PYO	Bite-Compiled PYTHON Code
PZ2	Curious Labs Poser Pose File
PZ3	Curious Labs Poser Document
PZA	MGI PhotoSuite II/III/4 Album File
PZC	GraphPad Prism Script
PZD	Pizazz Plus Defaults
PZF	GraphPad Prism Project
PZM	GraphPad Prism
PZO	Pizazz Plus Overlay
PZP	MGI PhotoSuite II/III/4 Project File
PZP	Pizazz Plus Palette
PZS	MGI PhotoSuite II/III/4 Slide Show File
PZS	Pizazz Plus Settings
PZT	GraphPad Prism Template
PZT	Pizazz Plus Transfer File
PZX	Pizazz Plus Swap File
PZZ	Curious Labs Compressed Poser File
Q00	Quicken 2000 File
Q01	Quicken 2001 File
Q98	Quicken 98 File
Q99	Quicken 99 File
Q9Q	BladePro Graphic Plugin File
QAB	QABUTIL File
QAB	SYBYL Binary Field Files
QAD	PF QuickArt Document
QAG	Norton Desktop Quick Access Group
QAP	Omnis Quartz Application File
QAX	ExpressTracker Data File
QB1	Quicken File
QBA	QuickBooks File
QBB	QuickBooks for Windows Backup File
QBD	Keyboard Layout
QBE	dBase IV Saved Query
QBE	Example Query (Query By Example)
QBE	Quattro Pro Saved Query
QBL	Business Lawyer Document
QBO	dBase IV Ordered Query
QBS	MS Quick Basic Program File
QBW	QuickBooks for Windows File
QBW	Quicken File
QCB	MS Combat Flight Simulator Quick Combat Editor File
QCD	Cliq Accessories Phonebook Data
QCD	QuarkCopyDesk SE
QCF	Q-emuLator (a Sinclair QL emulator)
QCF	QuickLogic Constraint File
QCH	Quicken for DOS ver 2 Data File
QCH	SSI Dark Queen of Krynn File
QCI	Cliq Accessories Phonebook Index
QCI	Massively Parallel Quantum Chemistry Program File
QCK	Jigsaw 2 Astrological Tool File
QCK	Quick Charts File
QCK	Quick Foram Count File
QCK	QuickCard File
QCK	VAX CRYSTALS Chemical Crystallogaphy File
QCM	3164 Emulator Quick Command File
QCM	QUCM Application File (Link is PDF file) (interface CATERPILLAR CCM devices to POWERLOGIC system)
QCP	Qualcomm PureVoice File
QCS	CADQC Standard File
QD?	Omnis Quartz Data File Segment (can be 0 to 9)
QDAT	Quicktime Installer Cache
QDF	Quicken for Windows Data File
QDI	Dictionary
QDI	Quicken Data File
QDK	Quarterdeck QEMM File
QDT	Quark Xpress Dictionary File
QDT	Question Mark Desigener Test File
QDT	Quick Books data file from the Quicken UK Accountancy/Tax/Invoice program
QDT	Quicken Data File
QDV	Steve Blackstock Giffer Graphics File
QEF	MS Excel Query
QEL	Quicken Electronic Library File
QEP	IRMA Wordstation for Windows
QFI	QuickTime Image
QFL	Family Lawyer Document (Now with Learning Company from Quicken)
QFN	QuickTime Font File
QFX	Quick Link Fax
QIC	Backup Set for MS Backup
QIF	Quicken Interchange Format.
    - Used as a standard mechanism to import/export financial transactions between various applications.
QIF	QuickTime Image
QIX	Quicken for DOS ver 2 Data File
QLB	MS C Quick Library
QLB	Quick Library
QLC	PostScript Help File
QLE	QOOLE (Quake Object Oriented Level Editor)
QLF	Family Tree Maker Genealogy File
QLP	QuickLink Printer Driver
QM	Quality Motion File
QM4	QMail Mail Door Option or Services File
QMD	Quicken for Windows ver 5,6 Data File
QML	Quicken for DOS ver 2 Data File
QMR	OzWin CompuServe E-mail/Forum Access Quickscan History
QMT	Quicken Memory List
QN2	QuickNote File
QNA	High ASCII Quake Name Maker
QNC	Cliq Accessories Notepad Customization
QND	Cliq Accessories Notepad Data
QNI	Cliq Accessories Notepad Index
QNM	High ASCII Quake Name Maker
QNT	Chromeleon Quantification Method
QNX	Quicken Indexes
QPB	Quicken Payroll File
QPD	QP Software Dynamic Plug-in
QPR	Generated Query Program (used by MS Visual FoxProÊ6)
QPR	OS/2 Printer Queue Driver
QPS	QP Software Application File
QPW	Quattro Pro Project File
QPX	Compiled Query Program (used by MS Visual FoxProÊ6)
QQT	Quick Qard Technology Qardware Definition File
QRD	BI/Query Query Result (used to be Andyne GQL)
QRP	Centura Report Builder File
QRP	Liberty for Windows Report File
QRS	WordPerfect Equation Editor
QRT	QRT Ray Tracing Graphic
QRY	BI/Query Query
QRY	dBase IV Query
QRY	MS Query
QS9	OzWin CompuServe E-mail/Forum Access Scan Result File
QSC	Pxyl Visuals Chart
QSD	Quicken for Windows Data File
QSL	OzWin CompuServe E-mail/Forum Access Forum Quickscan List
QST	Quake Spy Tab File
QT	QuickTime Movie
QTC	Incite Media Assistant File
QTI	QuickTime Image
QTIF	QuickTime Image
QTM	QuickTime Movie
QTP	Astra Quicktest Report
QTP	QuickTime Preferences File
QTPF	QuickTime PreFlight Text
QTPP	QTracker Quake 2 File (unverified)
QTS	MacÊOS PICT Image
QTS	QuickTime Image
QTW	QText File (mixed English/Hebrew)
QTX	QuickTime Image
QUE	CuteFTP Queue File
QUE	Task Scheduler Queue Object
QUICKEN	Quicken Spreadsheet
QVM	Quake File (UI.QVM or GAGAME.QVM in VM directory)
QW	Symantec Q&A Write Program File (Symantec word processor that integrates with Q&A databases)
QW5	Quicken 5 File
QW6	Quicken 6 File
QWB	MS Money Quotes WriteBack Import File
QWK	QWK Reader Message File
QWP	Quiptics Puzzle File
QWT	QAWin template file (Symantec word processor that integrates with Q&A databases)
QXB	Quark XPress Books File
QXD	Quark XPress Document File
QXL	Quark XPress Element Library
QXT	Quark XPress Template File
R	Pegasus Mail Resource File
R	Progress Compiled Program File
R	Ratfor FORTRAN Preprocessor File
R	Rebol Script
R??	RAR Compressed File (?? can be 01 to 99)
R1A	Yamaha RM1x Dance-Music Workstation
R2D	RISA-2D Simple Analysis & Design
R2K	Repertoire 2000 Music Database
R33	Train Simulator Game File
R3D	RISA-3D 3D Analysis & Design
R64	Top Secret Crypto File
R8	Flight Simulator Texture File
R8	RAW Graphic File
R8L	LaserJet Landscape Font
R8P	LaserJet Portrait Font
RA	Real Audio Sound
RA	RealMedia File
RAD	Radiance Scene Description Format
RAM	Real Audio Sound
RAM	RealMedia Metafile
RAP	Rapanalyst File (Rapid Application Predictive Technology Organization Resource)
RAP	Rapidocs Document
RAR	Java JCA Resource Adapter Module
RAR	RAR Compressed Archive
RAS	Cals Raster File
RAS	Sun Raster Images Bitmap
RAT	Nimbus 7 SAMS Data File (radiance data)
RAT	Rating System File
RAT	Rats Data
RAW	Nimbus 7 SAMS Data File (radiance data)
RAW	Raw File Format (bitmap)
RAW	RAW RGB 24-bit Graphic
RAW	Raw Signed PCM Data
RAW	Sentry 2020 Encryption File
RAW	VitaGraph File (medical testing related)
RAX	Image File
RB	RocketEdition File
RB	Ruby Interpreter Program
RB1	R:Base Data File
RB2	R:Base Data File
RB3	R:Base Data File
RBB	Top Secret Crypto File
RBF	R:Base Data File
RBH	RoboHelp Configuration
RBM	Propellerhead ReBirth Modulation v2.0
RBM	Rail Baron Player Map
RBS	Propellerhead Software ReBirth Song
RBX	XStream Multimedia Simulation Format
RBZ	Rail Baron Player Saved Game
RC	Borland C++ Resource Compiler Script File
RC	Emacs Configuration
RC	MS Visual C++ Resource Script
RC2	ReCycle v.2 Audio Loop
RCD	PC Anywhere Recorded Session File
RCG	Netscape Newsgroup File
RCH	SWAT Reach Output File (river basin scale model)
RCM	Logos Library System 2.x Verse Map
RCP	Recomposer's MIDI Sequencer Music File
RCS	Colin McRae Rally Save Game File
RCX	Lego Mindstorms Robotics Invention System
RCY	ReCycled Audio Loop
RD1	DATAIR Retirement Document System Data File
RD1	Descent1 Registered Level File
RD2	DATAIR Retirement Document System Custom Text File
RD3	CorelDream 3D
RD3	Ray Dream Designer Graphics
RD4	Ray Dream Designer Graphics
RD5	Ray Dream Designer Graphics
RDB	Gear CD Suite File
RDB	TrueVector Rules Database
RDB	ZoneAlarm Rules Database
RDF	Chromeleon Report Definition
RDF	Geoworks UI Compiler Source Code
RDF	Resource Description Framework File (see www.w3.org/TR/PR-rdf-schema/)
RDF	Workshare Synergy Collaboration Response File
RDI	Device-independent Bitmap
RDL	Descent Registered Level
RDL	RadioDestiny Radio Stream
RDS	Ray Dream Studio File
RDT	RDT Tracking File (capture design process and manage the system requirements)
RDX	Reflex Data File
REC	EpiInfo Data
REC	RapidComm Voice File
REC	Sprint Record File
REC	Windows Recorder Macro File
RED	Calrion Modula-2 Path Data
REF	Cross Reference
REG	Application Registration Data (various)
REGET	ReGet Deluxe Downloader
REM	Annotation (remark)
REP	Blizzard Entertainment Replay File
REP	Qwk Reader Reply
REP	Report File (various)
REP	Text Document
REQ	Request
RES	Championship Bass Archive
RES	Evil Islands Archive
RES	MS Visual C++ Resource
RES	Resource File (various programs)
REV	Geoworks Revision File
REV	Workshare Synergy File
REX	Oracle Report Definition
REX	ReCycled Audio Loop Export File
REX	REXX Program File
REZ	Aliens and Predator 2 Game File
REZ	Blood 2 Archive
REZ	No One Lives for Ever Archive
REZ	Resource File
REZ	Sanity: Aiken's Artifact Archive
REZ	Shogo Archive
RF	RealFlash Clip
RF	Sun Raster Graphic
RF?	SmartWare Compiled Project File (requires login)
RFB	RoboForm
RFD	Emperor: Battle for Dune Archive
RFD	RecogniFORM Form Definition
RFF	Maggi Graphic File
RFG	RFG Integrator System Database
RFH	Maxagrid CTM Refresh File (text format)
RFH	RFG Integrator Householding Database
RFL	RISAFloor Analysis & Design
RFT	IBM DisplayWrite Revisable Format Text
RFT	RFT-DCA
RGB	Picture File
RGI	RealArcade Game Installer (not secured)
RGP	RealArcade Game Package
RGS	RealArcade Game Installer (secured)
RGX	ReaGeniX Code Generator Symbol Table
RH	Borland C++ Resource Header File
RI	Lotus File
RIA	Alpharel Group IV Raster Graphics File
RIB	3D Reality Renderman Format Graphics
RIC	Ricoh FAX Graphic File
RIF	Fractal Painter Bitmap
RIP	Remote Imaging Protocol
RIX	ColorRIX VGA Paint File
RIX	RIX Virtual Screen
RL	The 7th Guest Archive
RL1	Descent1 Registered Level File
RL2	Descent2 Registered Level
RL4	Bitmap Graphics
RL8	Bitmap Graphics
RLA	Advanced Visualizer File
RLA	Wavefront Raster Image
RLB	Harvard Graphic File (Harvard Graphics taken over by Serif)
RLC	Image Systems CAD Overlay
RLC	Scanner One-bit/pixel Grahpic Output
RLE	Run-Length Encoded Bitmap
RLZ	Realizer Source Code
RM	Real Audio video file
RM	RealMedia File
RMD	MS RegMaid document
RMD	RegMaid Document
RMF	Rich Map Format (3D Games)
RMF	Rich Map Format (used by 3-D game editors to store a map)
RMI	MIDI Music Sequence File
RMJ	Real Jukebox File
RMK	Clipper RMake Make File
RML	Redline Markup Language File (XML-based exchange of design markup and redline information)
RMM	RealPlayer File
RMR	Resume Maker File
RMS	AutoCAD Data File for Boss RMS (River Modelling System)
RMS	Secure RealMedia File
RMX	RealJukeBox MP3 File
RN	Nota Bene XPL Program
RND	AutoCAD Rendering Slide
RND	AutoShade Format
RNG	Nokia Ringtone File
RNG	Top Secret Crypto File
RNL	GTX Runlength Raster Graphics
RNO	VAX Runoff File
RNX	RealPlayer File
ROL	Adlib Music File
ROM	MZ700 Emulator (MZ700.ROM)
ROM	Nintento 64 Emulation ROM Image
ROM	ROM Memory File (actually most any emulator or BIOS flasher)
ROQ	Medal of Honor - Allied Assualt
ROV	Rescue Rover Data File
RP	RealPix Clip
RP?	RescuePro Physician Invoice File (? can be 0-9)
RPB	Automotive Diagnostic File
RPC	Rich Photorealistic Content (ArchVision, Inc.)
RPD	Rapidfile Database
RPD	RPV Printing System File
RPK	Rippack File
RPL	Replica Text File
RPM	RealMedia Player File
RPM	Redhat Package Manager Archive for Linux
RPS	Propellerhead Software Reason Song
RPT	MS Visual Basic Crystal Reports file
RPT	Report (various)
RPV	Real Player Visualization File (animated effects to beat of music)
RPV	Rebel Poker Player File
RPV	RPV Printing System File
RPW	RPWiz Project (slide show development)
RPY	Grand Prix Legends Racing Simulation Game File
RPY	Star Wars - Tie Fighter Media
RQY	MS Excel OLE DB Query File
RR	Railroad Tycoon
RRS	Road Rash Save File
RS	Amiga Reassembler Resource Data File
RS	EROSION 3D Event File
RS_	MacÊOS File Resource Fork
RSB	Red Storm Image Format
RSB	Rogue Spear Bitmap
RSC	Resource File
RSC	SymbianOS Application Resource File (application resources)
RSF	Mediafour MacDrive MacÊOS Resource Fork
RSL	Adobe PageMaker File
RSL	Borland's Paradox 7 Report
RSL	PC Tools Resources Library
RSM	RuneSword II Game
RSN	Propellerhead Reason Audio File
RSP	Responce Text File
RSP	Rockwell Software Logix 5 File
RSP	Workshare Synergy Response File
RSS	Rockwell Logix 500 SLC-5 Software
RST	ANSYS Results
RT	RealText Clip
RTA	RoboHelp Configuration
RTF	Rich Text Format Document File (also used as Windows Help file script)
RTH	ANSYS Results
RTK	RoboHelp Configuration
RTL	NU 7.0 Runtime Library
RTL	Text File
RTM	Real Tracker Music Module (MOD) File
RTP	Gerber Sign-making Software File
RTP	RTPatch Update Package
RTP	TurboTax Update File
RTS	RealAudio RTSL Document
RTS	Realizer Runtime Library
RTS	RoboHelp Configuration
RTX	Mobile Phone Ringtone (extended ringtone format)
RTX	Reliacast Audience Manager Turnstile
RUL	InstallShield
RUN	PC Tools Script Tools Program
RV	RealVideo Clip
RVG	Revit External Group File
RVI	Revenant Archive File
RVN	Riven Saved Game
RVP	C|Net CatchUp File
RVP	MS Scan Configuration File (MIME)
RVS	Revenant Archive
RVT	Apache Rivet Tcl File
RVT	IEX Workforce Management Report (text file)
RVT	Incite Media Assistant File
RVT	Revit Design Setup File
RVT	VersaPro Reference View Table
RVW	Review (may just be text file)
RWG	Random Word Generator
RWP	IBM Configurator Report (if you don't have the program ask the sender to export to .RTF for you)
RWS	Borland C++ Resource Workshop Data File
RWX	RenderWare Script
RWZ	MS Outlook Rules Wizard File
RX	Reflex Database Driver
RXC	WRQ Reflection X Connection
RXD	Reflex Database
RXH	Reflex Database Help File
RXN	MDL RxnFile (MIME type chemical/x-mdl-rxnfile)
RXR	Reflex Database Report
RXS	Reflex Database Screen Driver
S	Assembler Source Code
S	Scheme Source Code
S$$	Temporary Sort File
S??	RAR Compressed File (?? can be 01 to 99 after .R99)
S01	WordPerfect Distribution File
S02	WordPerfect Distribution File
S03	WordPerfect Distribution File
S16	Sigames File
S28	Genesis or Sega32X Rom Image
S2P	Sonnet File
S3D	EverQuest File
S3I	ScreamTracker v3 Instrument
S3M	Scream Tracker 3 Music Module (MOD) File
S8	Simul8 Simulation
SA1	Panasonic e-wear MP3 Player File
SA8	Street Atlas File
SAD	Electronic Arts Black & White Game Sound File
SAD	Serveron Analyzer Data File
SAF	MusicMatch Jukebox Secure Audio File
SAH	SETI@Home Data File
SAL	Soritec Data
SAM	Ami Pro Text File
SAM	CalTech PaleoMag Data File
SAM	Map File (HOSTS.SAM - Maps IP addresses to machine names)
SAM	Signed 8-bit Sample Data
SAN	The Curse of Monkey Island Movie File
SAR	Phoenix Server Applications Standard Distribution Format (.JAR file in special directory)
SAR	Sons Of The American Revolution Family Tree Creator Data
SAS	SAS System File (statistical anaysis)
SAT	ACIS Solid Model (any ACIS-based CAD program)
SAV	Backup
SAV	Saved Configuration Info (various)
SAV	Saved File (various)
SB	Audio File
SB	Raw Signed Byte (8-bit) Data
SBD	Storyboard Editor Storyboard
SBF	Superbase 95 File
SBI	Sound Blaster Instrument File
SBK	Creative Labs SB AWE 32
SBK	Creative Labs Soundfont 1.0 Bank file (Soundblaster)
SBK	Emu SoundFont v1.x Bank Files
SBK	Statfoot32 Soccer League Tracking File
SBK	Superbase 95 File
SBL	Shockwave Flash Object
SBP	Scratchboard
SBP	SetupBuilder Professional Projects File
SBP	Superbase DML Program
SBR	Source Browser Support File
SBS	SWAT HRU Output File (river basin scale model)
SBT	Superbase Record Notes
SBW	Savings Bonds Wizard (U.S. Treasury program)
SC	Framework Screen Driver
SC	Ingres Embedded SQL/C Source File
SC	Paradox Source Code
SC2	II PC Instrument
SC2	MS Schedule+ 7 File
SC2	Sample Cell
SC2	SAS Catalog
SC2	SimCity 2000 City
SC3	dBase Screen Mask File
SC3	Harvard Screen Driver (Harvard Graphics taken over by Serif)
SC3	SimCity 3000 File
SC4	RollerCoaster Tycoon Scenario
SCA	SCA Datafile
SCA	Scala InfoChannel Script
SCB	Scala InfoChannel Published Script
SCB	System Cleaner
SCC	MS Source Safe File
SCC	Stamp Collector's Girl Friday Catalog File
SCC	Text File
SCD	Graphic (SCODL Scan Conversion Object Description Language)
SCD	Matrix/Imapro SCODL slide image
SCD	MS Schedule+ 7 File
SCD	TurboTax Schedule File
SCE	SoftCuisine Data Exchange File
SCF	ScoreMaker Multimedia Show
SCF	Symphony Spell Checker Configuration
SCF	Windows Explorer Command File
SCH	EAGLE Schematic File
SCH	MS Schedule+ 1 File
SCH	OrCad Schematics File
SCH	Xlinix Foundation Schematic
SCI	ScanVec Inspire File
SCI	SciFax FAX
SCI	System Configuration Data
SCL	SCALA Scale
SCM	ICQ Sound Compressed Sound Scheme
SCM	SchematicMaker (Topanga Software) File
SCM	Scheme Program
SCM	ScreenCam Movie
SCM	Starcraft Map File
SCN	Compressed Screen format
SCN	INSITU Project (scene) File (French software for office and kitchen planning)
SCN	TrueSpace2 Scene
SCO	High Score (various)
SCO	ObjectJ AuthorJ Saved Lesson
SCP	Dial-Up Networking Script
SCP	Script (various)
SCR	DOS DEBUG Input File (can be any extension but often .SCR)
SCR	Fax image
SCR	Faxview Fax
SCR	LocoScript Screen Font File
SCR	Procomm Plus Screen Snapshot File
SCR	Screen Saver
SCR	Script (various)
SCR	Statistica Scrollsheet
SCS	OzWin CompuServe E-mail/Forum Access SYSOP File
SCS	StuffIt Saved Criteria
SCT	Form memo (used by MS Visual FoxProÊ6)
SCT	Foxpro Screen
SCT	Lotus Screen Capture Text
SCT	OzWin CompuServe E-mail/Forum Access Forum Section Names
SCT	PC Tools Script Tools
SCT	SAS Catalog
SCT	Scitex Continuous Tone (CT) Bitmap
SCT	Windows Script Component
SCV	ScanVec CASmate File
SCW	Score Writer Document (music score)
SCX	ColorIRX Image File
SCX	Form File (used by MS Visual FoxProÊ6)
SCX	Stanford Chart
SCX	Starcraft Map File
SCY	ReaGeniX Security File
SD	Sound Designer I Audio
SD!	OzWin CompuServe E-mail/Forum Access Custom Messsage Search Online
SD2	SAS Database
SD2	Sound Designer 2 file
SD2	Sound Designer II Data Fork
SD2	Sound Designer II Flattened File
SD7	Daktronics Venus 7000 Electronic Sign Schedule
SDA	Fidonet Software Distribution Network Archive Description
SDA	PGP Encrypted Executable
SDA	SoftCuisine Data Archive
SDA	StarOffice Drawing
SDB	Group Mail Subscriber Plug-in File
SDB	Simply Accounting File
SDC	StarOffice Spreadsheet File
SDD	StarOffice Presentation File
SDF	Autodesk MapGuide Spatial Data Files
SDF	Schedule Data File
SDF	Standard Data Format
SDF	Standart-Delay-Format
SDF	System File Format
SDI	Fidonet Software Distribution Network Info
SDK	Autosketch Drawing
SDK	Roland S-series Floppy Disk Image
SDL	OzWin CompuServe E-mail/Forum Access Custom Messsage Search
SDL	SmartDraw Library
SDN	Fidonet Software Distribution Network Compressed Archive
SDN	Shell Archive
SDP	QuickTime Session Description Protocol File
    - resides on server; contains info about format, timing, & authorship of streamed media
SDR	SmartDraw Drawing
SDS	Raw Midi Sample Dump Standard File
SDS	StarOffice Chart
SDT	Dungeon Keeper 2 Archive
SDT	SmartDraw Template
SDT	Theme Park World Archive
SDV	Pinnacle Studio DV Video Editing Project
SDV	Semicolon Divided Values File
SDW	Lotus WordPro Graphic
SDW	Raw Signed DWord (32-bit) Data
SDW	StarOffice Text
SDX	Midi Sample Dump Standard Files Compacted by SDX
SE	ScopeEdit Project File
SEA	Self-Expanding Archive File (used by StuffIt for MacÊOS files and possibly by others)
SEB	Franklin eBookMan Format
SEC	Compressed Archive File
SEC	Disney Animation Studio Secured Animation File
SEC	MP3 Music File (unverified)
SEC	PGP Secret Key Ring
SEE	LISCAD Plus File
SEF	Steganos Encrypted File
SEG	Compressed File Segment
SEL	PaintShop Pro Selection File
SEO	ScopeEdit Object File
SEP	Tagged Image File Format (TIFF) Bitmap Separation
SEQ	Atari Animation File
SEQ	Bubble Chamber Sequential Instruction File
SEQ	Chromeleon Sequence List
SEQ	LifeForm File
SEQ	TestStand Sequence File
SES	Clarion Modula-2 Session Data
SES	Cood Edit Session file (common digital audio editor file)
SES	Digital Audio Editor File
SES	Hummingbird Exceed X-Session
SES	Shadow Security Scanner Session
SET	Atari Calamus-module/-driver Module-specific Setup (in Module folder!)
SET	Backup File Set
SET	Configuration (various)
SET	Driver Set
SET	File set for MS Backup
SET	Image Settings
SEU	Serials 2000 Encrypted S2K Update
SEW	Janome (New Home) Sewing Machine File
SEX	Urban Chaos Game File
SF	IRCAM SoundFile
SF	OS/2 WPS Attribute Storage
SF	Sound File
SF2	Creative Labs Soundfont 2.0 Bank File (Soundblaster)
SF2	Emu SoundFont v2.0 File
SFA	Sonic Foundry Video Editor Audio File
SFD	SoundStage Sound File Data
SFE	Split Files Shell Extension
SFF	Fritz Fax-Print File
SFI	SIS Framegrabber Graphics
SFI	SoundStage Sound File Info
SFI	Ventura Printer Font
SFK	Sound Forge Peak Data File
SFL	LaserJet Landscape Font
SFL	Ventura Printer Font
SFM	DART Pro 98 Soundtree Structure
SFN	SPX Font
SFP	LaserJet Portrait Font
SFP	Ventura Printer Font
SFR	Sonic Foundry Sample Resource
SFS	PCL 5 Scalable Font
SFS	StarOffice Frame
SFT	Chiwriter Screen Font
SFV	Easy SFV Creator
SFV	QuickSFV/WinSFV Checksum File (also see www.irnis.net)
SFW	Seattle Film Works File (Actually MGI PhotoSuite File)
SFX	RAR self-extracting archive
SFX	Self-extracting Archive
SG	ABC Snap Graphics User File
SG1	Stanford Graphics
SGD	SameGame Data File
SGF	Smart Game Format
SGF	Sonique Document with Graphics
SGF	StarWriter Document
SGI	Silicon Graphics IRIS Graphic File
SGL	StarOffice Master Document
SGM	SoftQuad XMetaL File
SGM	Standard Generalized Markup Language (see www.iso.ch/cate/d16387.html)
SGML	Standard Generalized Markup Language (see www.iso.ch/cate/d16387.html)
SGN	Sierra Print Artist Sign
SGO	SansGUI Object Library File (compiled class definitions and objects for building models)
SGP	SansGUI Project Model File (model configurations and input parameters defined by simulation
                                users for simulation runs)
SGP	Statgraphics Plus Statistics
SGS	SansGUI Schema Definition File (class schemas defined for a simulator)
SGT	DirectMusic Producer
SGT	Hitman Game Sound File
SGT	Signature Keyboard Macro
SGW	Settler GOLD for Windows Data File
SH	UNIX shar Archive File
SH	UNIX/Linux Shell Script
SH3	Harvard Presentation (Harvard Graphics taken over by Serif)
SHB	Corel Background File
SHB	Corel Show Presentation
SHB	Document Shortcut File
SHD	Print Spooler Shadow File
SHE	Medusa CAD File
SHG	Hotspot Editor Hypergraphic
SHIFTS	ARIA PIPP Chemical Shifts File
SHK	MacÊOS Compressed Archive File (could be Apple II archive)
SHM	WordPerfect Shell Macro
SHN	Shorten Audio Compression File
SHP	3D Modeling File (various)
SHP	3D Studio Shapes File
SHP	An ESRI Shapefile
SHP	GIS Software Geographic Shape File
SHR	UNIX shar Archive File
SHS	Shell Scrap Object File
SHTM	HTML File containing server side directives
SHTML	HTML File containing server side directives
SHTML	Secure HTML
SHW	Corel Show presentation
SHW	Harvard Graphics Presentation File
SHW	Show File
SHW	WordPerfect Slide Show
SHX	AutoCAD Shape Entities
SHX	GIS Software Geographic Shape Index File
SI	SoftImage Image File
SIB	Sibelius Music File
SID	Commodore 64 Music File (MIME type: audio/prs.sid) (see hvsc.c64.org)
SID	LizardTech MrSID Photo
SIF	Autodesk Spatial Index File
SIF	Spectral Scanner spectral imaging file
SIF	Windows NT Setup File
SIG	Signature File
SIG	Used by PGP (see www.pgpi.org)
SIK	Backup File
SIM	Simulation (various) (e.g. Setup for Nascar4)
SIR	SIR (Scientific Information Retrieval) Database (ver 1-3)
SIS	SymbianOS Installer File (application installation archive)
SIT	StuffIt Compressed Archive File (Multiple platforms)
SITHQX	StuffIt Compressed Archive File (Multiple platforms)
SIZ	Oracle 7 Configuration
SJF	Split Files Shell Extension
SKA	PGP Secret Keyring
SKB	QuickPOS (Point-Of-Sale) Standard Keyboard Layout File
SKF	Autosketch
SKL	Authorware Resource
SKL	Macromedia Director resource file
SKN	eRocket eBook Skin
SKN	FileWrangler/SecurDesk!/ImageForge Graphic Skin
SKN	The Sims (Maxis) 3D Body Mesh Skin Data
SKR	MS ScriptIt
SKY	ActiveSky Movie Clips for Palm OS
SL	EROSION 3D Soil Parameters
SL	PACT's Save Layout Extension
SL	S-Lang Program File
SLB	AutoCAD Slide Library
SLC	Telix Compiler SALT Script
SLD	AutoCAD Slide
SLDASM	Solidworks Assembly File
SLDDRW	Solidworks Drawing File
SLDLFP	Solidworks File
SLDPRT	Solidworks part File
SLF	Mail Warden
SLF	Segment Layout File (IMS Database related)
SLF	Shopcalc List File (Cabinet Door & Drawer Cutting List Calculator)
SLF	SLIDE: Scene Language for Interactive Dynamic Environments File
SLF	SortWizard Export Format
SLF	SuperLink Folder Manager for Readers
SLF	Suppose Stand List File
SLG	Chromeleon Audit Trail
SLI	MagiCorp Side Service Slide
SLK	Data Exchange File (Symbolic Link)
SLK	Symbolic Link (SYLK) spreadsheet
SLK	Timeslips Lock File
SLL	Sound File
SLM	MS Visual FoxPro
SLP	Timeslips Data File
SLT	Telix SALT Script Application
SLW	Settler LITE for Windows Data File
SM	Samna Word Text File
SM	ScriptMaker Script
SM	Simentor Data File
SM	Smalltalk Program File
SM	SoftSpoken Mailer Mailing List
SM3	DataCAD Symbol File/Ansoft 3D geometric model files
SMC	Super Nintendo Game-console ROM Image
SMCL	Stata Saved Formatted Logs
SMD	Sega Genesis/Mega Drive Emulator
SMD	StarOffice Mail
SMF	Smartfax Fax
SMF	StarOffice Formula
SMI	RealPlay SMIL File
SMI	Self Mounting Image File (MacÊOS)
SMIL	Synchronized Multimedia Integration Language
SMK	Smacker Compressed File
SML	Simple Markup Language
SMM	Ami Pro Macro
SMP	Ad Lib Gold Sample
SMP	PhotoImpact File
SMP	Sample or Samplevision Format
SMP	Sound File
SMS	MS Package Definition File (used now in place of .PDF)
SMS	Sega Master System Emulator
SMT	HiPer-Six Memo File
SMT	SmartWare II Text File
SMX	Statistica Matrix Spreadsheet
SND	AKAI MPC-series Sample
SND	Heroes of Might & Magic 3 Archive
SND	Mac OS Sound Resource
SND	MacÊOS Sound Resource
SND	NeXT Sound
SND	Raw Unsigned PCM Data
SND	Sound Clip
SNG	Midisoft Studio MIDI Song
SNI	MDK Archive
SNK	Strong Name Key File (part of the .NET architecture)
SNM	Netscape Mail
SNO	SNOBOL Program File
SNP	CoffeeCup HTML Editor Snippet
SNP	Computer Eyes Video Output
SNP	Snap Viewer File (MS Snap Viewer allows sharing a view of an Access report with someone without Access)
SNP	Snapview Shapshot
SNX	Second Nature Software Graphic
SO	Oberlin DRAGN Graph Algorithm
SOA	Sage MAS 90 Accounting Software File
SOC	SociometryPlus Sociometric Group
SOE	Shadows of the Empire
SOL	Game Solution (various games)
SOM	Paradox Sort Info
SOM	Quattro Pro Network Serial Numbers
SOU	SB Studio II Sound
SP	Splint Compressed Archive File (UNIX)
SPC	Multiplan Program
SPC	SNES Audio file
SPC	WordPerfect Temp File
SPD	Harvard Bitstream Typefaces (Harvard Graphics taken over by Serif)
SPD	Mini-driver
SPD	PostScript Printer Description File
SPD	Speech Data File
SPD	Speedo Scalable Font
SPF	EnerGraphics Slide Presentation
SPF	Site Publisher Profile
SPG	Sprint Glossary
SPH	SDR99 Speech Recognition Task SPHERE Waveform
SPI	Scanner Graphics
SPJ	Site Publisher Project File
SPL	Compressed Archive File
SPL	Digitrakker Sample
SPL	Infinity Engine Game Spell
SPL	Printer Spool File
SPL	Sample File
SPL	Shockwave Flash Object
SPL	Spell Checker
SPL	Split Files Shell Extension
SPL	Sprint Printer Driver
SPM	WordPerfect File
SPN	WordPerfect Distribution File
SPO	SPSS Statistical Program
SPP	Serif PhotoPlus Native Format File
SPP	Sprint Printer File
SPR	Generated Screen Program (used by MS Visual FoxProÊ<6)
SPR	Sprint Document Letter
SPR	Sprite
SPS	SharkPort File (transfers game saves from computer to PlayStation2)
SPS	Sprint Screen Driver
SPS	VAX/VMS Source Code
SPT	Liquid Audio Player Secure Portable Track File
SPT	MITAC Disk/System Management Utility Pack Support File
SPT	SPITBOL Program File
SPW	SigmaPlot Worksheet
SPX	Compiled Screen Program (used by MS Visual FoxProÊ<6)
SPX	Screen Peace Extension
SPZ	Spazz3d VRML File
SQ7	Daktronics Venus 7000 Electronic Sign Sequence
SQB	SyQuest Backup
SQC	Structured Query Language (SQR) Common Code File
SQL	Structured Query Language Data
SQR	Structured Query Language (SQR) Program File
SQS	Operation Flashpoint Game
SQZ	Compressed Archive File
SR1	SIR (Scientific Information Retrieval) Database
SR2	SIR (Scientific Information Retrieval) Database
SR3	SIR (Scientific Information Retrieval) Database
SR4	SIR (Scientific Information Retrieval) Database
SRB	Corel ClipArt ScrapBook
SRC	Sourcecode (various)
SRF	Sun Raster Graphic File
SRI	Voice It Link Compressed Voice File
SRM	Super Nintendo ROM Saved File (saved game)
SRP	QuickLink Script
SRPM	Redhat Linux RPM Source File
SRT	BSplayer Subtitle File
SRT	SDR99 Speech Recognition Task Speech Recogniser Transcript
SS	DrScheme Programming Environment File
SS	Oberlin DRAGN Graph Algorithm
SS	Ribbons File
SS	Splash Bitmap Graphic
SS	XShipWars Sound Scheme File
SSA	Subtitles
SSC	HP Library and Tape Tools Script
SSC	SwordSearcher File
SSD	SAS Database
SSF	Enable Spreadsheet File
SSH2	SSH Secure Shell Client
SSI	Installer/GD Software Setup Information
SSK	SmartSketch File
    - Use Hijaak to convert - SmartSketch became FutureSplash which became Macromedia's Flash)
SSK	SwordSearcher File
SSL	Corel Flowchart Symbol Library File
SSM	RealPlay Standard Streming Metafile
SSP	SAS Transport Data
SSS	Sudden Strike Saved Game
SST	Certificate Store
SST	Sea Surface Temperature File
SSX	ScreenShare Data File
SSX	VersaPro Smart Store Document
ST	Atari ST Disk Image
ST	NeoPaint Stamp File
ST	Scream Tracker Instrument Library
ST	SMALLTALK Program File
STA	Eudora File
STA	Reflection Saved State
STA	Spinmaker Plus Stack
STA	Statistica Spreadsheet
STB	Genus Stub Library
STC	OpenOffice Calc Template File
STD	LocoScript Standard Script File
STD	OpenOffice Draw Template File
STD	Prosa State Transition Diagram Graphic
STD	SureThing CD Labeler Document
STEALTH	Likely a text file (e.g., README.STEALTH)
STEP	AP203 Step File
STF	Setup Information
STF	ShrinkToFit Compressed Archive File
STF	Structured File
STG	PageKeeper Storage File
STG	Statistica Graphics File
STG	Visual Pinball High Scores (and other data: vpreg.stg)
STI	OpenOffice Impress Template File
STK	Personal Stock Monitor File
STL	CAD Software Solid Modeling/Prototyping File
STL	Certificate Trust List
STM	Prosa State Transition Diagram Model
STM	Scream Tracker v2 Music Module (MOD) File
STM	SDR99 Speech Recognition Task Time Segment Time Marked File
STM	SHTML File (HTML File Containing Server Side Directives)
STM	Sound File
STN	STiNG File (Iterated Systems resolution-on-demand images)
STO	Genus Pascal Stub OBJ File
STO	Infinity Engine Game Storage File
STP	AP203 Step File
STP	DART Pro 98 System Settings
STP	PageKeeper Packed Storage File
STR	DataPerfect Structure File
STR	dBase Structure List
STR	Fifa 2002 Music File
STR	Music File
STR	Sceensaver
STR	Statistica Report File
STR	Stream File (Playstation Discs)
STS	MS C Project Status Info
STS	Nimbus 7 SAMS Data File (status data)
STS	Scream Tracker Song
STU	Tarantella Enterprise 3 3270 Emulator Style File
STU	xyALGEBRA File
STV	sofTV.Author File (Streaming Video Web Authoring)
STW	OpenOffice Writer Template File
STW	SmartTerm Data File
STW	Statistica Workbook File
STX	EditPlus Syntax File
STX	Simply Tax Form
STX	SmarText E-book
STY	LaTeX2e Style
STY	MS Interactive Music Control
STY	Style Sheet (various)
STY	Ventura Publisher style sheet
SUB	CloneCd Related File
SUD	Super Project Analyzer Data
SUI	Simple User Interface Toolkit Library
SUITE	Winstyles Theme (customizes the Windows Desktop)
SUM	Summary (various)
SUN	Sun Raster Graphic File
SUP	Super Porject Analyzer Project
SUP	WordPerfect Supplemental Dictionary
SUR	Surveyor Document
SV$	AutoCAD Autosave File
SV1	Transport Tycoon Saved Game
SV4	RollerCoaster Tycoon Saved Game
SVB	Statistica Macro File
SVC	Statistica Macro File
SVD	Word Backup File
SVF	WinSFV (Checks for damaged .rar files)
SVG	Scalable Vector Graphics File
SVG	Word Backup File
SVGZ	Compressed (Zipped) Scalable Vector Graphics
SVI	Mimio Ink Files
SVL	Scramdisk VoLume (Win98 freeware also opened by DriveCrypt)
SVO	Statistica Macro File
SVP	SwiftView Command File
SVP	WISCO Survey Power
SVQ	Roland Keyboard Midi Sequence
SVS	DART Pro 98 Spectral View Settings
SVS	Word Backup File
SVX	Amiga 8SVX Sound
SVX	Interchange File Format, 8SVX/16SV
SVX	Statistica Macro File
SW	Audio File
SW	Raw Signed Word (16-bit) Data
SW	SmartWare Spreadsheet (requires login)
SWA	SATLOC FreeTrac (GPS Guidance and mapping)
SWA	Shockwave Audio File in Macromedia Director (an MP3 file)
SWB	Adobe PageMaker 7.0 ColorSync Component
SWB	Sametime Whiteboard File
SWB	Super Win-EBook 98 File
SWD	Sabiston Textbook
SWD	Storybook File (educational)
SWF	Macromedia Shockwave Flash Format
SWF	MS Sidewinder (Force Feedback Joysticks) Profile Activator
SWFS	Macromedia Dreamweaver File
SWG	Swag Reader Packet
SWI	Swish Data File (Swish makes Flash files)
SWK	Swapkeys Keyboard File
SWL	Macromedia Flash Format
SWP	Sprint Backup File
SWP	Swap File (virtual memory storage)
SWS	Science Workshop File
SWS	Screen Writer Studio File
SWS	SmartWidgets File
SWS	S-PLUS Workspace
SWS	Swift Generator Instruction File
SWS	VHDL Simili Sonata Project File
SWS0	Screen Writer Studio File Backup
SWT	Macromedia Authoring Flash File
SWT	Space Watch Pro Data File
SWT	Swift Generator Template File
SWT	VB Setup Wizard Template File
SXC	OpenOffice Calc File
SXD	OpenOffice Draw File
SXI	OpenOffice Impress File
SXM	OpenOffice Math File
SXW	OpenOffice Writer 6.0 Text File
SXW	Staroffice Word Document
SY#	Darn! Backup Files
SY1	Ami Pro Smartpix Symbol Library
SY3	Harvard Symbol File (Harvard Graphics taken over by Serif)
SYD	Sysedit Backup File
SYL	SYLK Spreadsheet Format
SYM	Borland C++ Precompiled Headers
SYM	Symbol Table (various)
SYN	Breakneck / N.I.C.E.2 Archive
SYN	Excessive Speed Archive
SYN	SDSC Image Tool File
SYN	Synonym File
SYN	TextPad Syntax Definition
SYS	System Configuration
SYS	System Device Driver
SYW	Harvard Symbol Graphic (Harvard Graphics taken over by Serif)
SYW	Yamaha SY-series Wave Files
SZ0	Binary File Format (used when uploading via a COM port)
T	Tads Source File
T	TAR Tape Archive Without Compression
T	Turing Programming Language File
T??	Ingres Table/Index File (?? = Hex 00 to FF)
T??	Kiplinger Tax Cut State Return Files (?? is the two-character state designation)
T??	RAR Compressed File (?? can be 01 to 99 after .S99)
T_1	Polytext Ma'archot Meida Co. S"TaM ("Sifriyah Toranit M'muchshevet" - Computerized Torah Library)
T2K	Teach2000 Document
T2T	Sonata CAD Modelling File
T3D	Electric Rain Swift3D Default Source Format
T6	Extension of Czech text editor Text602 version <= 3.00 from company Software602
T64	C64S Emulator Program
T64	Commodore 64 tape collection (see www.nims.nl/C64/)
T98	Kiplinger Tax Cut File (1998 Tax Year)
T99	Kiplinger Tax Cut File (1999 Tax Year)
TAB	Guitar Tablature File
TAB	MapInfo Table
TAF	Birdstep Technologies RDM Database (may be embedded in other software)
TAG	Dataflex Query Tag Name
TAH	Turbo Assembler Help File
TAI	INMOS Transputer Development System Occam Analyse Info
TAL	Adobe TypeAlign Text Illustration File
TAM	Tame Program Settings
TAO	IsoBuster File
TAP	Commodore 64 tape image
TAR	Compressed Archive File
TAR	Tape Archive
TAX	Turbotax File
TAZ	Compressed File (short for .tar.z)
TAZ	UNIX Gzip/Tape Archive
TB1	Turbo C Font
TB2	Turbo C Font
TBC	Inovate Tool Bar Customization
TBC	IronCAD Tool Bar Customization
TBF	Imavox TurboFax Faxs
TBG	TeamBG File (modify Infinity Engine games)
TBK	Asymetrix Toolbook
TBK	Memo backup (used by MS Visual FoxProÊ6 and other database programs)
TBL	Adobe PageMaker Import Mapping Table
TBL	OS/2 Table of Values
TBP	TAS Books Accounts
TBR	SoftQuad XMetaL Toolbar/Menu Configuration
TBX	Project Scheduler Table
TC	Borland Configurations File
TCF	Theme Park World Game File
TCH	Borland Help File
TCI	INMOS Transputer Development System Occam Configuration Info
TCL	SLIDE: Scene Language for Interactive Dynamic Environments File
TCL	TCL/TK Language Script
TCL	TextPad Clip Library
TCM	INMOS Transputer Development System Occam Comment Text File
TCW	TurboCAD Drawing
TD	Turbo Debugger Configuration File
TD2	Turbo Debugger Configuration File
TD4	RollerCoaster Tycoon Track Design
TD4	ThumbsPlus Version 4.x+ Graphics Database
TDA	Palm Date Book File
TDB	Thumbs Plus Database
TDF	TheDraw Font
TDF	Trace Definition File
TDF	Typeface Definition File (for fonts)
TDH	Turbo Debugger Help File
TDK	Turbo Debugger Keyboard Record
TDO	Compressed File
TDP	Serif DrawPlus Thumbnail
TDS	Turbo Debugger Symbol Table
TDW	Turbo Debugger Configuration File
TDY	TODAY or BuildPro Application File
TE	Textease File
TE2	Conquest of the New World
TEA	Tea Template Source File
TED	Tribes 2 Game File
TEE	TeeChart Office Graphic
TEF	Relisys Tefax Fax
TEL	Telnet Host File
TEM	Badge Designer 2000 File
TEM	Icon Author Template
TEM	Turbo Editor Macro Language
TEMP	Audiogalaxy Downloading Music File (file renamed when download complete)
TER	Daylon Leveller Heightfield Data
TER	TerraGen Landscape File
TET	Textease Template
TEX	Idealist Datasheet
TEX	Mackichan Scientific Notebook File
TEX	TeX/LaTeX file
TEX	Texture File
TF	Turbo Profiler Configuration File
TFA	Turbo Profiler Area File
TFC	Tobi's Floppy Cataloguer Catalog
TFH	Turbo Profiler Help File
TFM	Tagged Font Metric
TFM	TeX Font Metric File
TFM	Toplevel Form File
TFR	IBM Client Access File Transfer
TFR	Star Wars - Tie Fighter Game-Pilot File
TFS	Turbo Profiler Statistic
TFW	Digital Raster Graphic World
TFX	Traffix Traffic Analysis Software
TG1	On Target Project File
TG4	CCITT Group 4 Fax
TGA	File used by some game programs
TGA	Targa bitmap
TGA	Truevision Targa Graphic
TGD	Nimbus 7 SAMS Data File (gridded temperature data)
TGH	TrueGas Host File
TGM	Nem's Mega 3D Terrain Generator
TGW	Terragen Atmosphere File
TGZ	UNIX Gzip/Tape Archive
TGZ	UNIX Tar File Zipped (short for .tar.gz)
THB	Bitmap Graphic
THD	Thread
THEME	MS Plus! Theme File
THEME	Windows 95 Desktop Theme
THM	MS Clipart Gallery Database
THM	Serif DrawPlus Theme
THN	Graphics Workshop for Windows Thumbnail
THP	LiveMath Plug-in
THP	TurboTax-related File
THS	WordPerfect Thesaurus
THU	Command and Conquer Renegade File
TIE	X-wing Alliance Game File
TIF	Digital Raster Graphic Image
TIF	Tagged Image File Format (TIFF) Bitmap
TIFF	Tagged Image File Format (TIFF) Bitmap
TIG	Tiger File, used by US government to distribute maps
TIL	Togai InfraLogic Fuzzy-C Knowledge Base
TIM	Playstation Game Texture Image
TIM	The Incredible Machine Level File
TIP	Startup Tip File (various)
TIS	MahJongg Tile Set
TIX	ASA for UNIX Terminfo Extension File
TIX	DivX File
TIX	Hybrid Graphics File (both vector and raster data)
TIX	Tix Widgets
TJF	VAXTPU Backup File (VAXTPU is default OpenVMS editor)
TK2	Take Two/Easy CD Creator Backup
TKB	TicketBench Data File (design/print tickets)
TKM	Panasonic SD Voice Editor File
TKN	Liberty BASIC Application Distribution File
TLB	Bubble Chamber Reference Table
TLB	OLE Type Library
TLB	Remote Automation Truelib Files
TLB	VAX Text Library
TLB	Visual C++ Type Library
TLC	Swat Compiled Tood Command Language Source
TLD	Trellix File
TLE	NASA Two-Line Element Set
TLF	Avant! Memory Compiler Memory Models Format File
TLF	Gear Track List File (CD burning) (Used to be .CUE; just rename .CUE to .TLF)
TLF	Short Message Service File (GSM phone messaging)
TLF	Turnpike SCORE Link File
TLG	Trellix WebGem
TLK	Hand of Fate Archive
TLK	Lands of Lore Archive
TLP	MS Project Timeline File
TLS	Timeless Time & Expense
TLT	TList Data File
TLT	Trellix Web Design File
TLX	Telex
TLX	Trellix Data File
TMA	DCI TradeManager Catalog Archive
TMC	DCI TradeManager Catalog Archive
TMF	WordPerfect Tagged Font Metric File
TMG	The Marketing Game File
TMO	Zortech C++ Global Optimizer Output File
TMP	Temporary File/Folder
TMQ	TestMaster File
TMR	Simpsons Cartoon Studio File
TMS	Telemate Script
TMW	Trados Workbench translation memory file
TNC	SuperJPG ThumbNail Cache File
TNK	Nimbus 7 SAMS Data File (pre-launch calibration data)
TNK	OMEGA Tank File (Origin Systems game no longer marketed)
TNK	TrunkTrac Scanner Info
TOC	Eudora Table Of Contents
TOL	Kodak Photoenhancer
TOP	INMOS Transputer Development System Occam Top Level File
TOS	Atari Self-extracting Archive
TOT	Telelogic Option Templates
TP	EROSION 3D Relief Parameters
TP	Turbo Pascal Configuration File
TP	Turbo Profiler Session-state File
TP3	Harvard Template (Harvard Graphics taken over by Serif)
TP4	RollerCoaster Tycoon Track Design Screenshot
TPB	HiJaak PCL Soft Font File Backup
TPF	HiJaak PCL Soft Font File
TPH	Turbo Pascal Help File
TPJ	TestStand Project
TPL	CakeWalk Audio Template File
TPL	Canvas 7 Template
TPL	DataCAD Template File
TPL	fKey Template Designer Template File
TPL	Harvard Template (Harvard Graphics taken over by Serif)
TPL	Timeslips TSImport Template
TPL	Turbo Pascal Library
TPL	Turbo Pascal Resident Units
TPM	TextPad Macro
TPP	Teleport Pro Project (Web spider)
TPP	Turbo Pascal Protected Mode Units
TPP	TypePlus File
TPR	GROMACS 3.0 Molecular Dynamics Simulator File
TPR	TMPEG Enc Video Conversion Project File
TPR	Together Project Definition
TPS	Clarion for Windows Data File
TPU	Turbo Pascal Unit
TPU	VAXTPU Command File (VAXTPU is default OpenVMS editor)
TPW	Turbo Pascal Unit
TPW	Turbo Profiler Session-state File
TPZ	Compressed File (short for .tar.gz)
TR	Manual Page Input to UNIX troff -man Command
TR	Turbo Debugger Session-state Settings
TR2	Turbo Debugger Session-state Settings
TR5	Tree Professional File
TRC	Oracle SQL*Net Trace Debug File
TRC	Power CTrace Debug Support File
TRC	True BASIC Compiled Code
TRE	EA SPORTS File
TRE	Kith and Kin Export File (document/store family trees)
TRE	PC Tools Directory Tree
TRE	VisiRex SDK Tree Function File
TRE	Wing Commander Series Movie/Game File
TRF	DocuMagix File
TRK	Kermit Script File
TRK	Mixman Studio Track
TRK	Train Dispatcher Railroad Centgralized Traffic Control Simulation
TRM	Terminal Settings File (various)
TRM	TRiM High-compression Lossless 8 to 32 bit Truecolor Image File
TRN	Adobe PageMaker File
TRN	MKS Source Integrity Project Usage Log
TRN	MS SQL Server Transaction Backup
TRN	Quattro Translation
TRN	STN Express Transcript Text File
TRN	Translation File
TRP	Tripmaker File
TRS	EROSION 3D Temporal Event File
TRS	Micrografx Executable File
TRT	Team Sports Scheduling System Report Template
TRU	True BASIC Source Code
TRU	TruSys System Comparison File
TRW	Turbo Debugger Session-state Settings
TRX	Emerald PC Authorize Batch Transaction File
TS	Tune Smithy File
TSC	Top Secret Crypto File
TSCE	TextShield Zip-compressed .RTF File (TextShield Compression Engine)
TSK	PhotoImpact Quick Command
TSK	Skins (Themes) for Pocket PC PDAs
TSL	Borland TeamSource File
TSP	Windows Telephony Service Provider
TSR	INMOS Transputer Development System Occam Program Source
TSS	Team Sports Scheduling System Project File
TST	Test File
TST	TextShield Template
TST	WordPerfect Printer Test File
TSW	TestStand Workspace
TSX	Team Sports Scheduling System XML Project File
TT	ThinkTank Outliner (old Apple program)
TTC	TrueType Compressed Font
TTF	TrueType Font
TTK	Alchemy Catalyst Translation Toolkit (purchased from Corel)
TTL	Tera Term Macro File
TTO	IBM Client Access File Transfer Description
TTP	Telelogic Tau Project
TTR	TeeTree Office File
TTW	Telelogic Tau Workspace
TTX	Crystal Report Data Connection File
TUB	PaintShop Pro Tube File
TUD	Thumbs Plus Viewer Graphics
TUO	Thumbs Plus Viewer Graphics
TUT	Tutorial
TV	Paradox Table View Settings
TV1	WordPerfect Overflow File Above Doc 1 Insert Point (can be 1-9)
TVM	TVMconv
TVT	RealPlayer
TWC	Tripwire Configuration File (intrusion detection)
TWD	Simtech MindMapper Mind Map
TWE	ThinkWave Educator Data File
TWF	Georeferenced Information File
TWF	TabWorks File
TWG	ThatWaltGuy Web Server File
TWP	Toplevel Computing Fine Words (DOS Word Processor)
TWP	Tripwire Policy File (intrusion detection)
TWR	Tripwire Report File (intrusion detection)
TWS	TextPad Workspace File
TWS	Tripwire Schedule File (intrusion detection)
TWW	Tagwrite Template
TX8	MS-DOS Text File
TXB	Descent/D2 Encoded Briefing File
TXC	Urban Chaos Game File
TXF	Compressed File (short for .tar.f)
TXI	TeX Support File
TXM	DATAIR Pension Reporter Data File
TXT	Text Document File (open in Notepad, WordPad, Word, or many other programs)
TXW	Yamaha TX16W Wave Files
TXX	DataPerfect Text Storage
TYM	Adobe PageMaker Time Stamp
TZ	Compressed File (short for .tar.z)
TZ	Ingres Time Zone File
TZB	Compressed File (short for .tar.z.btoa)
U	Unreal System File
U2	Telelogic Tau UML Model
U2E	Unreal Game Translation
U2P	Telelogic Tau UML Program Text File
U8	Raw Unsigned 8-Bit Audio Data
U96	EasyZip Temporary File
UAP	User Agent Wireless Telephony Profile
UAX	Unreal Audio File
UB	Audio File
UB	Raw Unsigned Byte (8-bit) Data
UC2	Compressed File
UCF	Xilinx Foundation User Constraint File
UCM	Urban Chaos Game File
UCN	Compressed Archive
UCS	Universal Classification Standard Database File
UDB	PINO 3-Server File
UDF	MS Excel User Defined Function
UDF	Photostyler Image Filter
UDF	Windows NT Uniqueness Database File
UDL	MS Data Link
UDW	Raw Unsigned DoubleWord (32-bit) Data
UE2	Encrypted Archive
UFO	Ulead Object File
UG	Drawing File (various)
UHA	UHARC Compressed Archive
UHS	Universal Hint System File
UHTM	Unreal Tournament File
UI	Geoworks UI Compiler Espire Source
UI	User Interface
UIF	WordPerfect Long Prompts
UIH	Geoworks UI Compiler Espire Header
UIS	WindowBlinds Skin (changes the look and feel of WindowsÊXP)
UL	uLAW Audio File
ULD	Procomm Uploaded Files
ULS	Internet Location Service
ULT	UltraTracker Music Module (MOD) File
ULW	ULAW - Sun/NeXT
UMB	MemMaker Backup Archive
UMOD	Unreal Tournament Self-extracting MOD File
UMX	Unreal Music File
UNI	Forcast Pro Data File
UNI	MikMod (UniMod) Format
UNL	Informix Binary File Created by UNLOAD Command
UNQ	Fax View File (unverified)
UNR	Unreal Map File
UNX	Text File (usually UNIX)
UPD	dBase Update File
UPD	ProUpdater Per/Directory Options Setting File
UPD	Universal Print Driver (cross-platform)
UPD	Updated Program Data (various)
UPI	ULead Photo Impact Program File
UPJ	ULead Project File
UPO	dBase Compiled Update File
UPX	ULead Photo Express Saved Image File
URF	Radar ViewPoint Universal Radar Format
URL	Internet Location/Shortcut (in MS IE)
USA	Unreal Saved Game File
USB	D-Link FM Radio Update
USB	USB Protocol Analyzer Trace (USBChief, USBAdvisor, USBTracer)
USE	MKS Source Integrity File
USL	LaserJet Landscape Font
USP	Adobe PageMaker Printer Font
USP	LaserJet Portrait Font
USR	User Database (various)
UTF	AOL Updating Files (found in TOD [Tools on Demand] folder)
UTL	Sound File
UTP	BinPatch Patch Data File
UTX	Unicode File (editor: UniPad)
UTX	Unreal Texture File
UU	Compressed Archive File (UUENCODE)
UU	UU-encoded File
UUD	Uudecoded File
UUE	Uuencoded File
UVR	Ulead Cool 360 Viewer File
UVW	geoManager/geoInterface User View
UW	Audio File
UW	Raw Unsigned Word (16-bit) Data
UW	Unitype GlobalWriter File
UWF	UltraTracker Wave File
UWL	WordPerfect User Word List
UZR	UZR 3D Streamable 3D File Format
V	ReaGeniX Code Generator Consistency Check Support File
V	Verilog File
V	Vivid Main Input File
V2D	VersaCAD File
V3D	Vecta3D Model File
V64	Nintento 64 Emulation ROM Image
V8	Covox 8-bit Audio
VAD	Mapper Variant File (program for taking an adjudication from a diplomacy judge)
VAG	Sony PlayStation ADPCM Sound File
VAL	dBase Values
VAL	Paradox Validity Checks
VAM	Velazquez Application Map
VAN	VistaPro Animation
VAP	Annotated Speech
VAR	Icon Author Variable
VAR	Sterling Software Data Dictionary File (Sterling merged with Computer Associates)
VB	VBScript File or Any VisualBasic Source
VBA	VBase File
VBD	ActiveX File
VBE	VBScript Encoded Script File
VBG	Visual Basic Group Project
VBK	VisualCADD Backup File
VBL	User Control Licensing File
VBN	Norton Corporate Anti-Virus Quarantined File (Caution: file may be infected)
VBP	Visual Basic Project
VBR	Remote Automation Registration Files
VBS	Visual Basic Script
VBW	Visual Basic Project Workspace
VBX	Visual Basic Custom Control/Extension
VBZ	Wizard Launch File
VC	VisiCalc Spreadsheet File
VCD	Virtual CD-ROM
VCD	VisualCADD Drawing File
VCE	Natural MicroSystems Voice File
VCE	NMS file...audio-related, used by Cool Edit
VCF	vCard File
VCF	Vevi Configuration File; defines objects for use with Sense8's WorldToolKit
VCF	VP HybridCAD Native Format
VCH	Interlock Public Computer Utility
VCI	VP HybridCAD Native Format
VCM	Visual Component File
VCS	MS Outlook vCalendar File
VCS	Video Clipstream Video File
VCT	Visual Class Library Memo (used by MS Visual FoxProÊ6)
VCW	MS Visual C++ Workbench Information File
VCX	FoxPro Class Library
VCX	Spreadsheet File
VCX	Visual class library (used by MS Visual FoxProÊ6)
VDA	CAD File (federation of the automobile industry surfaces interface file)
VDA	Targa Bitmap
VDB	Norton AntiVirus Corporate Edition Update File
VDB	PC-cillin Quarantined File
VDF	AntiVir Virus Definition File
VDF	Vexira Anti-virus Virus Definition File
VDO	VDOScript File
VDR	ComputerEasy Draw File
VDT	SwiftView Command File
VDT	VersaPro Variable Declaration Table
VDX	Vector Graphic File
VDX	Virtual Device Driver (also see .VXD)
VDX	VMM32.VDX: system driver that checks duplicate .VXD files and switches to protected mode
VDX	XML for Visio Drawing File
VEE	HP VEE Project File (visual environment for microelectric circuits)
VEM	VeePro Embroidery Software Format
VEM	Voice E-mail File
VENUE	VenueBench Data File
VER	Version description file
VEW	Clipper Viewfile
VEW	Lotus Approach View File
VFM	Voter Voting Form
VFN	Voter Customer Voting Form
VFW	Video for Windows
VGA	Targa Bitmap
VGA	VGA Screen Driver
VGD	Generic CADD VGA Driver
VGM	Video Game Music File Format
VGR	Ventura Graphic
VHD	VHDL Design File (text file used in design projects)
VHDL	VHDL Design File (text file used in design projects)
VI	Jovian Logic VI Graphics
VI	LabView File
VI	Virtual Instrument file from National Instruments LABView product
VIB	Chemsoft Export/Import MSDS Data
VIC	Vicar Picture File
VID	Media Player Video
VID	Monitor Control File
VID	MS-DOS 5 Shell Monitor File
VID	QuickTime Video
VID	Screen Driver
VIF	Khoros Visualization Image File
VIK	Viking Picture File
VIM	VIM (Vi IMproved) Editor File
VIR	Virus Infected File (renamed by Symantec Anti-Virus)
VIS	Picture File
VIT	LabView File
VIV	VivoActive Player Streaming Video File
VIZ	Division dVS/dVISE File
VJS	QuickTime Music File
VL2	Tribes 2 Game (actually a ZIP file)
VLB	Corel Ventura Library
VLD	DataFlex Variable Length Data File
VLM	Ashlar Vellum CAD Drawings Extension
VLT	Darn! Passwords! Vault File
VM	Geoworks Virtual Memory File
VM1	Panasonic SD Voice Editor File
VMC	Acrobat Virtual Memory File
VMDC	VMware Virtual Disk File
VMDK	VMware Virtual Disk File
VMF	FaxWorks Audio File
VMF	Ventura Font Characteristics
VMO	Cosmopolitan Virtual Makeover File
VMO	Siemens Sl45 Mobile Phone Voice File
VMO	Virtools Behavioral Server Composition (Web-based Protected Format)
VMP	Logos Library System 2.x Verse Map
VMS	Sega Dreamcast VMU Save File
VMS	Sound File
VMX	VMware Configuration File
VNC	Virtual Network Computing
VO	Vivid Include File
VOB	DVD Video Movie File (MPEG-2 program streams with additional info)
VOC	Creative Labs Sound Blaster Sound File
VOC	Quartet Audio File
VOC	Sound File
VOF	VZ Programmer Object Folder
VOID	Halflife Map Voids File
VOL	Earth Siege 2 Archive
VOL	Giants: Citizen Kabuto Archive
VOL	Tribes 2 Game File
VOL	Tribes Extreme Archive
VOX	Dialogic ADPCM
VOX	Natural MicroSystmes Voice File
VOX	Talking Technology Inc. File
VOX	Vox Audio
VP	Freespace Archive
VP	Ventura Publisher File
VPD	VitaGraph File (medical testing related)
VPG	VPGraphics File
VPP	Red Faction/Summoner Package File
VPP	Virtual Pool Game (unverified)
VPT	Visual Pinball File
VQE	Yamaha Sound-VQ Locator File
VQF	Yamaha Sound-VQ File
VQL	Yamaha Sound-VQ Locator File
VRC	SATLOC VRC (Variable Rate Control)
VRF	Oracle 7 Configuration File
VRM	Quattro Pro Overlay File
VRML	A VRML file
VRO	Panasonic DVD Recorder File
VRP	Watcom Project File
VRS	WordPerfect Graphics Driver
VS	Vivid Include File (Surface definition)
VS2	Roland-Bass Transfer File
VSD	Visio Drawing (flow chart or schematic)
VSDISCO	SOAP Dynamic Discovery File (MS SOAP & .NET apps)
VSF	Atari Calamus-module/-driver Verlauf Setup Filter = Blend (graduated tint) setup filter (Blend module)
VSL	GetRight Download List File
VSM	VisSim Simulation Model
VSP	SPX Sprite
VSP	Virtusales ASP Compiler Project File
VSS	Shapeware Visio Smartshapes File
VSS	Visio Stencil
VST	Targa Bitmap
VST	Truevision Vista Graphic
VST	Visio Template
VSW	Visio Workspace File
VSX	XML for Visio Stencil File
VT	Linux VT100 File (use cat command to view)
VTM	Cold Fusion Studio Query
VTX	XML for Visio Template File
VUE	3D Studio Animation
VUE	dBase or Foxpro View
VUE	MS Visual FoxProÊ2.x view
VVF	ViVerify Fingerprint
VVP	Visual Voice Project File
VVR	ViVerify Repair
VVT	VersaPro Variable View Table
VW	Lightscape View
VW	Volkswriter Text File
VWF	CADvance Drawing File
VWL	MGI VideoWave Video Wave Library (MGI to be bought by Roxio)
VWR	PC Tools File Viewer
VWT	MGI VideoWave Video Wave Thumbnail (MGI to be bought by Roxio)
VXD	MS Windows Virtual Device Driver (also see .VDX)
VXML	VoiceXML Source File
VXS	Voice Xpress User Profile
W	Applause Word Chart
W	Progress Database File
W??	Divided Compressed File (?? = 01 to 99; used when installs needed to be on individual floppy disks)
W14	Genesis 2000 File
W30	Ventura Printer Font
W31	Windows 3.1 Startup File
W3D	Black Belt Systems Ray Trace Control File
W40	Windows 95 Backup File
W44	dBase Temporary File
W64	Sonic Foundry Video Editor Wave64 File
WAB	MS Outlook Address Book
WAD	Doom Game File (also used for other games)
WAD	Gunman Chronicle Archive
WAD	Half-Life Archive/Texture File
WAD	Heretic Archive
WAD	Hexen Archive
WAD	Large file for Doom game containing video, player level, and other information
WAD	Quake Archive
WAD	Theme Park World Archive
WAG	Urban Chaos Saved Game File
WAL	Quake 2 Texture File
WAL	WalMaster Showlist File
WAR	Archived Konqeror (KDE) HTML Page
WAR	Java Web Archive
WAS	Procomm Plus Script Source Code File
WAV	Waveform Audio (PCM Wave)
WAV	Windows Waveform sound
WAX	Metafile (points to Windows Media Video [.WMA] file)
WAX	Procomm Plus Compiled Script File
WB	Dictionary Project Data File
WB1	QuattroPro for Windows Spreadsheet File
WB2	QuattroPro for Windows Spreadsheet File
WB3	QuattroPro for Windows Spreadsheet File
WBA	Winace ZIP File
WBA	WindowBlinds Compressed Skin (changes the look and feel of WindowsÊXP)
WBC	Webshots Picture Collection (library)
WBD	Webshots Graphic Format
WBF	Windows Batch File
WBK	MS Word Backup File
WBK	WordPerfect Workbook
WBL	Argo WebLoad II Upload File
WBM	Webmin Module
WBR	Crick WordBar File
WBS	WebExpress Website File
WBS	Webshots Screensaver
WBS	WinBot IRC Client Script
WBT	Crick Wordbar Template
WBT	WinBatch Script
WBX	Webigger File
WBZ	WebShots File
WCD	WordPerfect Macro Token List
WCFG	WildTangent Configuration
WCM	WordPerfect Macro
WCM	Works File Transmission
WCP	WordPerfect Product Info
WD2	Info Select for Palm Organizer File
WD2	WordExpress Document
WDA	RUMBA OFFICE 95/N Configuration File
WDAT	WildTangent Data File
WDB	MS Works database
WDB	Works Database
WDF	Workshare DeltaView DeltaFile (difference between two documents)
WDK	WhizFolder Desktop File
WDL	3D Game Studio Window Definition File (this one is free)
WDL	3D Game Studio World Definition Language File (this one you pay for)
WDL	Windows XP Watchdog Log File
WDR	Star Wars - Tie Fighter Media
WEB	CorelXara Web document
WEB	Web Vector Graphic File
WED	Corel Xara Web Document
WF1	EViews Workfile (Econometric software)
WFA	WinFax Pro Archive
WFB	Turtle Beach WaveFront Bank
WFD	Turtle Beach WaveFront Drum Set
WFM	dBase Form Designer Form Object
WFN	Corel Symbols and Fonts
WFP	Turtle Beach WaveFront Program
WFS	Windows Installation Script
WFX	Winfax Data File
WG1	Lotus 1-2-3 Worksheet
WG2	Lotus 1-2-3 Worksheet
WGF	WaterGuide File (Decision Support System Water Reuse)
WGP	Wild Board Games Data File
WGT	Worms Armageddon Teams File
WHT	MS NetMeeting Old Whiteboard Document
WI	Wavelet Compressed Bitmap
WI	Wavelet Image (different compression for JPEG)
WID	Ventura Width Table
WIF	Wang Image File (usually fax related)
WIF	Wavelet Image File
WIF	Weaving Information Format
WIL	Windows Interface Language Script
WIL	WinImage File
WIN	Window File (used by MS Visual FoxProÊ6 and dBase)
WIN	Windows Backup File
WIN	Wonderware InTouch Window
WINI	WildTangent Configuration File
WIP	Windows Installer Project (opens with MS Visual Studio Installer)
WIS	wIntegrate Basic Script File
WIZ	Wizard File (MS Publisher and MS Word)
WJP	WildTangent Branded .JPG File
WK!	Lotus Spreadsheet File
WK1	Lotus 123 versions 1 & 2 Spreadsheet File
WK3	Lotus 123 version 3 Spreadsheet File
WK4	Lotus 123 version 4 Spreadsheet File
WKB	WordPerfect Document File
WKB	Workbook File
WKE	Lotus Educational Version Spreadsheet File
WKQ	Quattro Spreadsheet
WKS	Lotus 123 Worksheet spreadsheet
WKS	Lotus Spreadsheet File
WKS	MS Works Spreadsheet
WKS	XLISP Workspace
WKZ	Compressed Spreadsheet
WL1	File for Shareware Version of Wolfenstein 3D
WL6	File for Registered Version of Wolfenstein 3D
WLD	REND386/AVRIL File
WLF	Argo WebLoad I Upload File
WLG	Dr. Watson Log
WLK	Virtus Walkthrough Graphics
WLL	MS Word Add-In
WLL	The Sims (Maxis) Wall Texture File
WLR	VRML Page
WLS	602 pro PC SUITE Worksheet File
WLV	Web Link Validator File
WLZ	Compressed Floppy Image
WMA	Windows media audio
WMA	Windows Media File (contains audio)
WMC	Windows MathCad Startup File Backup
WMC	Wordmarc Text File
WMC	WordPerfect Macro
WMD	Windows Media Download File (compatible with Windows Media Player 7 or later)
WMF	Windows Metafile
WML	Wireless Markup Language File (HTML file for wireless devices)
WMN	DART Pro 98 Playlist
WMP	MS JScript Proxy Auto-Configuration
WMS	Windows Media Skin File (compatible with Windows Media Player 7 or later)
WMV	Windows Media File (contains both video and audio)
WMX	Audio Playlist
WMZ	Windows Media Compressed Skin File (compatible with Windows Media Player 7 or later)
WN	Write Now Text File
WNF	Corel Outline Font
WNS	PrintShop Newsletter
WOA	Windows Swap File
WOC	Windows OrgChart Organization
WOR	MapInfo Workspace
WOW	Grave Composer Music Module (MOD) File
WP	WordPerfect Document File
WP4	WordPerfect 4 Document File
WP5	WordPerfect 5 Document File
WP6	WordPerfect 6 Document File
WPA	ACT! Word Processor File
WPA	Word processing document native to ACT! database program
WPC	MS WordPad File Converter
WPD	602 pro PC SUITE Document File
WPD	WordPerfect Demo, Screen Driver or Document
WPF	Enable Word Processing File
WPF	WordPerfect Text File
WPF	WorldPort Fax
WPG	WildTangent Branded .PNG File
WPG	WordPerfect/Drawperfect Graphics File
WPI	WCPUID Plug-in (WCPUID confirms reliability of presentation data by CRC code)
WPJ	W32Dasm Project File
WPK	Keyboard
WPK	WordPerfect Macros
WPM	WordPerfect Macro
WPS	MS Works Text Document File
WPT	602 pro PC SUITE Template Document File
WPT	WordPerfect Template
WPW	Novel PerfectWorks document
WPW	PerfectWorks Document
WPX	Adobe Printer Information File (Usually found in C:\Windows)
WQ!	Compressed Quattro Pro Spreadsheet
WQ1	Quattro Pro/DOS Spreadsheet
WQ2	Quattro Pro/DOS version 5 spreadsheet
WR!	Compressed Lotus Spreadsheet
WR1	Symphony Spreadsheet File
WRD	Charisma Template
WRF	WebEx Recording (MS Office add-in for meetings, etc.)
WRI	Write Document (Use MS WordPad to open)
WRK	Cakewalk Music Project File
WRK	Spreadsheet File
WRL	Plain Text VRML (Virtual Reality Model) File
WRML	Plain Text VRML File
WRP	Amiga Compressed Archive File
WRS	WordPerfect Windows Printer Driver
WRT	IBM Writing Assistant File (DOS Application)
WRX	Progress Database File
WRZ	Another VRML fileject
WRZ	GNUZIP Compressed VRML File
WS	Atari Calamus-module/-driver Wokr-tool Setup (Paint module)
WS	Hummingbird Exceed File
WS	IBM iSeries Client Access File
WS	SmartWare Worksheet (requires login)
WS	WordStar Document
WS1	WordStar for Windows 1 Document
WS2	WordStar for Windows 2 Document
WS3	WordStar for Windows 3 Document
WS4	WordStar for Windows 4 Document
WS5	WordStar for Windows 5 Document
WS6	WordStar for Windows 6 Document
WS7	WordStar for Windows 7 Document
WSAD	WildTangent Actor Definition
WSBM	WildTangent Material File
WSC	Windows Script Component
WSD	EROSION 3D Watershed
WSD	WordStar Data File
WSDL	Web Services Description Language File (used by XML applications)
WSE	Wise File
WSF	Windows Script File
WSGO	WildTangent Mesh and UVW Mapping File
WSH	Windows Script Host Settings File
WSM	SMS Installer Working File
WSMO	WildTangent Motion File
WSP	Chromeleon Wordspace
WSP	Fortran PowerStation Workspace
WSQ	Wavelet-packet Scalar Quantization
WST	WordStar Text File
WSX	WinMX Filesharing Program
WSZ	Winamp Media Player File Extension (usually represents a zip file from Winamp, like a skin or plugin)
WT	WildTangent Branded .X 3D Model
WT2	WordExpress Document Template
WTXT	WildTangent Branded .TXT File
WVE	Component of a DIVX Movie Conversion
WVE	Psion Series 3a/3c/3mx Waveform Sound File
WVL	Wavelet Compressed Bitmap
WVX	Metafile (points to Windows Media Video [.WMV] file)
WWB	WordPerfect Button Bar
WWK	WordPerfect Keyboard Layout
WWL	MS Word Add-in File
WWP	Worms World Party Teams File
WWV	WildTangent Branded .WAV File
WXB	EXP: The Scientific Word Processor
WXP	EXP: The Scientific Word Processor Document
WXS	Easy Cross File (cross stitch design)
WZB	Librarian of OZ Sharp Book Viewer Add-on
WZD	Sharp Organizer Program or Data File
WZN	WhizFolder Document
X	Amapi 3D Modeling (prior to version 4)
X	AVS Image
X	LEX Program File
X_T	Parasolid CAD File
X01	Paradox Secondary Index (can be 01 to 09)
X16	Macromedia Program Extension (16-bit)
X32	Macromedia Program Extension (32-bit)
X3D	Xara 3D Project File
X4M	TeamLinks Mail File Data
X5	Rockwell Software Logix 5 File
XA	Extended Architecture File
XA	File on PSX Disc
XA	Gear CD Suite File
XA	Maxis Extensive Audio (audio compression used with SimCity 3000, The Sims, etc)
XAB	MS Mail Address Book
XAB	Xenis Mail Address Book
XAN	XANIA Browser
XAN	xyALGEBRA File
XAR	Corel Xara X Vector Drawing File
XBM	X Bitmap Graphic
XBS	ETAK MapBase
XCF	GIMP Image File
XDF	Workshare Synergy File
XDP	UNIX File
XFD	Adobe Text File
XFM	OmniForm XML Format
XFN	Ventura Printer Font
XFR	Symantec Norton Anti-Virus Corporate Version Failed Update
XFT	Chiwriter 24 Pin Printer Font
XFX	Fax File (various)
XGR	MS Graph Edit XML Graph
XI	Fast Tracker 2 Instrument
XI	ScreamTracker Instrument File
XIF	Often a Fax Image (TIFF) File
XIF	ScanSoft Pagis XIF Extended Image Format (FAX)
XIF	Wang Imaging File
XIF	Xerox Image File
XIP	Hotbar Image Compression Format
XL	Old Amiga Movie Format
XLA	MS Excel Add-in File
XLA	Xlib Archive
XLB	MS Excel Toolbar File
XLC	MS Excel Chart File
XLD	MS Excel Dialogue File
XLG	Xnetech Engraving Logo File
XLK	MS Excel Backup File
XLL	MS Excel Add-in File (Dynamic Link Library)
XLM	MS Excel Macro File
XLR	MS Works File
XLS	DATAIR Data Import Specification Translation File
XLS	MS Excel Worksheet/MS Works Spreadsheet File
XLT	Lotus Translation Table
XLT	MS Excel Template File
XLT	Procomm Plus Translation Table
XLV	MS Excel VBA Module
XLW	MS Excel Workspace
XM	Fast Tracker 2 Extended Module
XM	FastTracker 2, Digital Tracker music module (MOD) file
XM	Sound File
XMB	X-Wing Mission Briefing File
XMI	EverQuest File
XMI	Winamp Extended Midi File
XML	Extensible Markup Language File (see www.w3.org/XML/)
XMP	Graphic File
XMS	ViewCafŽ XML Markup Session
XMT_TXT	Parasolid CAD File
XMX	AutoCAD External Message Compiled File
XMX	Character Set File
XNF	Standard Network File Form
XNG	OM2 911 Xchange Version 6 Document
XNK	MS Exchange Shortcut File
XOT	Xnetech Job Output File
XP	WinXP Theme
XPL	Music File
XPM	X Picsmap Graphic
XPO	Omega Research ProSuite
XPTHEME	Winstyles Theme (customizes the Windows Desktop)
XPW	Screen-Fillable Surfer Version of a Form
XQL	Extensible Query Language
XQT	SuperCalc Macro Sheet
XQT	Waffle Executable File
XR1	Epic MegaGames Xargon Data File
XRF	Cross Reference File
XS	Age of Mythology Artificial Intelligence File
XS	Hummingbird Exceed File
XSD	XML Schema File (read in text editor)
XSI	Softimage XSI
XSL	Extensible Stylesheet Language (see www.w3.org/Style/XSL/)
XSM	LEXIS-NEXIS Tracker
XSN	xyALGEBRA File
XT*	Crosstalk Related File
XTB	LocoScript External Translation Table
XTG	Quark XPress Tags File
XTP	XTree Data File
XTR	RealArcade Compressed Data File
XTS	CSPro File (combined IMPS and ISSA Census Processing System)
XUL	Netscape Adaptation File
XUL	XML User Interface Language
XVU	BOClean Database File
XWD	Crossdown Puzzle File
XWD	X Windows Dump
XWF	Yamaha XG Works File (MIDI sequencing)
XWI	X-Wing Mission File
XWK	Crosstalk Keyboard Mapping
XWP	Crosstalk Session
XWP	Xerox Writer Text File
XWP	XMLwriter XML Editor File
XX	Xxencoded File
XXE	Xxencoded File
XXX	Singer Sewing Machine Professional SewWare File
XXY	SPARC Executable Script File (e.g., /etc/hostname.xxy identifies network interface on local host)
XY	XYWrite Text File
XY3	XYWrite III Document File
XY4	XYWrite IV Document File
XYP	XYWrite III Plus Document File
XYW	XYWrite 4.0 Document File
XYZ	XMol XYZ (MIME type chemical/x-xyz)
Y	Amiga Yabba Compressed Archive File
Y	Desktop Color Separation Specification Yellow Layer (usually an EPS file)
Y	Yaac Grammar File
Y01	Paradox Secondary Index (can be 01 to 09)
YAL	Arts & Letters Clipart Library File
YBK	MS Encarta Yearbook File
YENC	yEnc Encoded File (usually on usenet)
YLT	TheWord & Bible Companion Young's Literal Translation Bible
YMAP	Ygnius Computer Aided Thinking File
YMG	Yahoo! Messenger File
YNC	yEnc Encoded File (usually on usenet)
YPS	Yahoo! Messenger File
YSP	Bitmap Graphic
YUV	Color Space Pixel Format
YZ	Yac Compressed Archive File
Z	Compressed Archive File
Z	UNIX Gzip
Z#	Frotz Z-Code Game
Z??	WinZip Split Compressed Archive (?? is a number from 01 upward)
Z3	Infocom Game Module
Z64	Nintendo 64 Emulator
Z80	ZX Spectrum Emulator
ZA?	(? = A, B, C,...) Output of the UNIX SPLIT Utility (portions of a file)
ZAP	FileWrangler Compressed File (only used in beta)
ZAP	MS Windows Software Installation Settings
ZARGO	Poseidon UML CE/SE Diagram
ZAX	Z-Axis 3-D Office Design Software
ZBA	Compressed File Run Through UNIX COMPRESS and BTOA Utilities
ZBD	Canon ZoomBrowser Database File
ZBD	MechWarrior 3 Snow Fields File
ZBD	Zebedee Encrypted File
ZBF	Z-Buffer Radiance File
ZC	Zipkey Configuration File
ZCH	ZIG File (ZIG Game Construction Kit)
ZDB	Wonder Word Data File
ZDF	Z-Firm Document Folder
ZDG	ZView Compressed Document
ZDP	ZDNet Password Pro 32
ZEI	ANNO 1602 Game
ZER	Zerberus File
ZFS	C++ Assembly Source
ZFS	Interstate '76 Archive
ZFS	Interstate '82 Archive
ZFS	Z-Firm File Stub
ZGM	ZenoGraphics File
ZHP	Zipped SwiftView File
ZID	Z-Firm ID
ZIG	ZIG Game File (ZIG Game Construction Kit)
ZIM	PagePath Technologies Compressed MacÊOS File
ZIP	Zip Compressed Archive File
ZL?	ZoneAlarm Mailsafe Renamed File
(ZoneAlarm Mailsafe will quarantine mail attachments and change their extension.
The conversions are: .ADE to .ZL0, .ADP to .ZL1, .BAS to .ZL2, .BAT to .ZL3, .CHM to .ZL4,
.CMD to .ZL5, .COM to .ZL6, .CPL to .ZL7, .CRT to .ZL8, .EXE to .ZL9, .HLP to .ZLA, .HTA to .ZLB,
.INF to .ZLC, .INS to .ZLD, .ISP to .ZLE, .JS to Z0, .JSE to .ZLF, .LNK to .ZLG, .MDB to .ZLH,
.MDE to .ZLI, .MSC to .ZLJ, .MSI to .ZLK, .MSP to .ZLL, .MST to .ZLM, .PCD to .ZLN, .PIF to .ZLO,
.REG to .ZLP, .SCR to .ZLQ, .SCT to .ZLR, .SHS to .ZLS, .URL/.ASP to .ZLT, .VB to .Z1, .VBE to .ZLU,
.VBS to .ZLV, .WSC to .ZLW, .WSF to .ZLX, .WSH to .ZLY)
ZLX	Atlantis Ocean Mind Word Processing File
ZM?	ZSNES Movie (? = number of the movie)
ZMF	Zoner Draw File
ZMK	Z-Up Maker Project File
ZMV	ZSNES Movie File
ZOM	Amiga Compressed Archive File
ZOO	Compressed Archive File
ZOO	Zoo Tycoon Game File
ZPK	Z-Firm Package
ZPL	ZIG File (ZIG Game Construction Kit)
ZSK	Embroidery Machine Stitch File
ZSR	Form*Z Temporary Save File
ZTE	E-Tabs Reader File
ZVD	ZyXEL Voice File
ZW	Chinese
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