Every file format in the world

This is a list of file name extensions or suffixes that indicate the format or usage of a file and a brief description of that format. We don't really show the file format itself here. In fact, many formats are proprietary and we couldn't show them to you. In some cases, we link to a definition of the file format or to related information.

In general, if you have the program that uses the file format, that program can be used to open or otherwise use the file. Some file formats (for example, the GIF file format used for Web page images) are standard formats that can be opened by any program that supports that standard format.

Many people have contributed to this list and we thank them! If you know of file name extensions that should be added to this list, please e-mail us and we'll add them.

Current file name extentions and definitions as of 6/15/00: 4,431

Every file format in the world - A through E
A

A Object code library
A Library file (Unix)
AA Audible audio file (commonly used for downloadable audio books)
AAM Authorware shocked file
AAS Authorware shocked packet
AB Applix Builder file
ABF Adobe Binary Screen Font
ABK Backup file (PrintMaster Gold)
ABK Data backup file (Avigo)
ABK Corel Draw AutoBackup
ABM Audio album file (HitPlayer)
ABM Album file (Image), (PALS)
ABO Applix Builder Turbo file
ABR Brush file (Adobe PhotoShop)
ABS MPEG Audio Sound file
ABS Standard GNU compiler output file for a PC platform
ABS Sometimes used to denote an abstract (as in an abstract or summary of a scientific paper) AutoBackup
ABS Data file (Abscissa)
ABW Document file (AbiWord)
AB$ Plot file spooled for printer (AutoCAD AutoSpool)
ACA Project Manager Workbench file
ACA HTTP animation file (Microsoft Agent)
ACAD Database file (AutoCAD)
ACB ACBM Graphic image
ACB Archived data file (ACB)
ACC DR-DOS Viewmax file
ACD Character definiton file (Microsoft Agent)
ACE ACE Archiver Compression file
ACF HTTP character file (Microsoft Agent)
ACF Adobe custom filter (Adobe PhotoShop)
ACGI WWW script file
ACI ACI development appraisal (ACIWEB)
ACL Corel Draw 6 keyboard accelerator file
ACM Windows system directory file
ACM Interplay compressed sound file (Fallout 1,2, Baulder's Gate)
ACM Dynamic Link Library (DLL)
ACM Add-on file for Audio Compression Module(s),(Microsoft Windows Codecs)
ACM Image file (ACBM)
ACMB Image file (ACBM)
ACO Colour Palette (Adobe PhotoShop)
ACP Microsoft Office Assistant Preview file
ACR American College of Radiology file
ACS Character structered storage file (Microsoft Agent)
ACT Microsoft Office Assistant Actor file
ACT FoxPro Foxdoc Action Diagram
ACT Action Presentation
ACT Source code file (Actor), (Graphics cell, and others)
ACT Documenting wizard action diagram (Microsoft Visual FoxPro)
ACT Colour Table (Adobe PhotoShop)
ACV Used to Compress and decompress audio data
AD After Dark screensaver
AD2 2-bit compressed voice file (ADCPM), (ZFAZ), (used in voice, data,fax transmisiions)
AD3 3-bit compressed voice file (ADPCM), (ZFAX), (used in voice,data,fax transmissions)
ADAAda source text file (non-GNAT)
ADB Ada source text body file (GNAT)
ADB HP 100LX Organizer Appointment database
ADC Scanstudio 16 color Bitmap Graphic file
ADC Dictionary text file (Lingvo)
ADD OS/2 adapter driver file used in the boot process
ADE Audio file (ADC,TI/MIT)
ADEX Image file (Bitmap), (ADEX Corp)
ADF Amiga disk file
ADI AutoCAD device-independent binary plotter file
ADI Graph file (AutoCAD)
ADL QEMM Mca adaptor description library
ADM After Dark MultiModule screensaver (Microsoft)
ADM Windows NT policy template
ADN Lotus 1-2-3 Add-In file
ADP Dynamic Page file (AOLserver)
ADP FaxWorks Faxmodem setup file
ADP Astound Dynamite file
ADPCM Audio codec (Intel/DVI adaptive differential pulse code modulation)
ADR After Dark Randomizer screensaver
ADR Smart Address address book
ADS Ada source text specification file (GNAT)
ADT HP NewWave datafile for card applications
ADT AdTech Fax file
ADT Dictionary data file (Lingvo)
ADV Virtual device driver (VXD), (GUS)
ADX Dynazip Active Delivery script
ADX Lotus Approach dBase Index
ADX Archetype Designer Document
ADZ Packed ADF file (Extracts with WinZip)
AE Author/Editor file (SoftQuad)
AEP ArcExplorer project file
AEX Armored extracted public encryption key (PGP)
AEXPK Armored extracted public encryption key (PGP
AF2 ABC FlowCharter 2.0 Flowchart
AF3 ABC Flowchart
AFC Apple Sound file
AFI Truevision Bitmap graphic
AFM Adobe font metrics
AFM HP NewWave Cardfile application
AFP Graphics file (IBM)
AG Applix graphic
AI Adobe Illustrator drawing
AI Corel Trace drawing
AIFAudio Interchange File, a sound format used by Silicon Graphics and Macintosh applications
AIFC Similar to AIF (compressed)
AIFFSimilar to AIF
AIM AOL Instant Messenger Launch file
AIN AIN Compressed archive
AIO APL transfer file
AIS ACDSee Image Sequence
AIS Velvet Studio Instruments file
AIS Xerox Arry of Intensity Samples Graphic
AIX HP NewWave Cardfile Application data
AKW Contains all A-keywords in the RoboHELP Help Project Index Designer not associated with topics
ALAW European Telephony audio
ALIAS Alias Image
ALB JASC Image Commander album
ALI Document file (SAP proprietary format)
ALL Arts & Letters Library
ALL WordPerfect for Windows General printer information file
ALS Alias Image
ALT WordPerfect Library Menu
AM Applix SHELF Macro
AMF Music file (Advanced Module Format)
AMF DSMIA/Asylum module music (Crusader,No Remorse,Aladdin)
AMG AMGC Compressed archive
AMG ACTOR System image
AMI Annotation file (Cocreate SolidDesigner)
AMS Velvet Studio music module (MOD) file
AMS Extreme's Tracker module
AN Text file (Sterling Software) (Groundworks COOL Business Team Model)
ANC Canon Computer Pattern Maker file that is a selectable list of pattern colors
ANI Microsoft Windows Animated cursor
ANM DeluxPaint Animation
ANN Windows 3.x Help annotation
ANS ANSI Text file
ANT SimAnt for Windows saved game
AOS Nokia 9000 Add-on software
AOT Applicatio binary object template file (ZenWorks snAPPshot)
AP Applix Presents file
AP WHAP Compressed Amiga archive
APC Compiled application file (Centura Team Developer)
APC Lotus 1-2-3 Printer driver
APD Dynamic application library file (Centura Team Developer)
APD Lotus 1-2-3 Printer driver
APF Lotus 1-2-3 Printer driver
APF Project file (Allaire) (Created by Homesite)
API Application Program Interface; used by Adobe Acrobat
API Lotus 1-2-3 Printer driver
APL Application library file (Centura Team Developer)
APL APL Workspace file
APP Normal mode application file (Centura Team Developer)
APP Symphony Add-in Application
APP Generated application or active document (Microsoft Visual FoxPro)
APP dBase Application Generator Object
APP DR-DOS Executable Application
APP FoxPro Generated Application
APR ArcView project file
APR Employee Appraiser Performance Review file
APR Lotus Approach 97 View file
APS Microsoft Visual C++ file
APS Advanced patching systems with error checking, (Similar to IPS)
APT Lotus Approach Data view file
APT Text mode application file (Centura Team Developer)
APX Lotus Approach Paradox-Specific information file
APX Borland C++ Appexpert database
AQ Applix data
ARC LH ARC (old version) compressed archive
ARC SQUASH Compressed archive
ARF Automatic Response file
ARI ARI Compressed archive
ARI Aristotle audio file
ARJ Robert Jung ARJ compressed archive (ARJ)
ARK ARC File Archiver CPM/Port archive
ARL AOL v4.0 organizer file
ARR Atari Cubase Arrangement
ART Xara Studio drawing
ART Canon Crayola art
ART Clip Art
ART Ray Tracer file
ART First Publisher Raster graphic
ART AOL Image file compressed using the Johson-Grace compression algorithm
ARX ARX Compressed Archive
AS Applix Spreadsheet
ASA Microsoft Visual InterDev file
ASC ASCII text file
ASC PGP armored encrypted file
ASD WinWord AutoSave file
ASD Lotus 1-2-3 Screen driver
ASD Microsoft Advanced Streaming Format (ASF) description file; opens with NSREX
ASD Astound Presentation
ASE Velvet Studio Sample file
ASF Music file (Electronic Arts)
ASF Microsoft Advanced Streaming Format
ASF StratGraphics Datafile
ASF Lotus 1-2-3 Screen font
ASH TASM 3.0 Assembly language header
ASI Borland C++/Turbo C Assembler Include file
ASM Assembler Language source file
ASM Pro/E assembly file
ASO Astound Dynamite Object
ASPActive Server Page (an HTML file containing a Microsoft server-processed script)
ASP Procomm Plus setup and connection script
ASP Astound Presentation
AST Astound multimedia file
AST Claris Works "assistant" file
ASV DataCAD Autosave file
ASX Cheyenne Backup script
ASX Microsoft Advanced Streaming Redirector file
ASX Video file
AT2 Aldus Persuasion 2.0 Auto Template
ATM Adobe Type Manager data/info file
ATT AT&T Group 4 bitmap
ATW AnyTime Deluxe for Windows personal information manager file from Individual Software MultiModule screensaver
AU Sun/NeXT/DEC/UNIX sound file
AU Audio U-law (pronounced mu-law)
AUD Audio file (Westwood Studios) (Kyrandia 3,C&C,RedAlert,C&C:TS)
AUX TeX/LaTeX Auxilliary Reference file
AUX ChiWriter Auxilliary Dictionary file
AVA Avagio Publication
AVB Inculan Anti-Virus virus infected file
AVI Microsoft Audio Video Interleaved file for Windows movie
AVR Audio Visual Research file
AVS Application Visualization System file
AVS Stardent AVS-X Image
AVX File Extension (ArcView)
AW HP AdvanceWrite Text file
AW Applix Words file
AWD FaxView Document image
AWK AWK Script/Program
AWM Animation Works Movie
AWR Telsis file for digitally stored audio
AWS StatGraphics Data file
AXL ArcIMS XML project file
AXT ASCII application object template (ZenWorks snAPPshot)
AXX ARJ compressed file from a multi-volume archive (xx = a number from 01 to 99)
A3L Authorware 3.x library
A4L Authorware 4.x library
A5L Authorware 5.x library
A3M Authorware MacIntosh file (unpackaged)
A4M Authorware MacIntosh file (unpackaged)
A4P Authorware file (packaged without runtime)
A3W Authorware Windows file (unpackaged)
A4W Authorware Windows file (unpackaged)
A5W Authorware Windows file (unpackaged)

Every file format in the world
B

B Applause Batch list
BAD Oracle bad file
BAK Backup file
BAL Ballade Music score
BAR dBase Application Generator Horizontal menu object
BAS BASIC source code
BAT Batch file
BB Papyrus Database backup
BBL TeX/BibTeX Bibliographic reference file
BBM Deluxe Paint Bitmap image
BBS Bulletin Board Sytem text
BCH Batch Process Object (dBase Application Generator)
BCH Datalex Entry Point 90 Data file
BCM Microsoft Works Communications file
BCO Bitstream Outline font description file
BCP Borland C++ Makefile
BCW Borland C++ 4.5 Environment settings file
BDB Microsoft Works Dababase file
BDF West Point Bridge Designer file
BDF Egret Datafile
BDR Microsoft Publisher Border
BEZ Bitstream Outline font description
BF2 Bradford 2 Font
BFC Windows 95 Briefcase Document
BFM Font Metrics file (Unix/Mainframe)
BFX Fax document file (BitFax)
BG Microsoft Backgammon Game file
BGA OS/2 Graphic array
BGI Borland Graphics Interface Driver
BGL Microsoft Flight Simulator Scenery file
BHF pcAnywhere Host file
BI Binary file
BIB Bibliography file (ASCII)
BIB TeX/BibTeX Literature Database
BIB Database
BIF GroupWise initialization file
BIF Image Capture Board Binary Image black & white graphic
BIFF XLITE 3D file
BIN Binary file
BIO OS/2 Bios file
BIT X11 Bitmap
BK Backup file (Generic)
BK JetFax Faxbook file
BK$ Backup file (Generic)
BK! WordPerfect for Windows Document backup
BK1 WordPerfect for Windows Timed backup file for document window 1
BK2 WordPerfect for Windows Timed backup file for document window 2
BK3 WordPerfect for Windows Timed backup file for document window 3
BK4 WordPerfect for Windows Timed backup file for document window 4
BK5 WordPerfect for Windows Timed backup file for document window 5
BK6 WordPerfect for Windows Timed backup file for document window 6
BK7 WordPerfect for Windows Timed backup file for document window 7
BK8 WordPerfect for Windows Timed backup file for document window 8
BK9 WordPerfect for Windows Timed backup file for document window 9
BKP TurboVidion Dialog Designer Backup
BKS IBM BookManager Read bookshelf file
BKS Microsoft Works Spreadsheet Backup
BKW FontEdit Fontset mirror image
BLB Resource archive (DreamWorks),(Neverhood)
BLD BASIC Bloadable picture file
BLK Alias Wavefront Image
BLK WordPerfect for Windows Temporary file
BM Windows system Bitmap
BMF Corel Gallery file
BMK Windows Help bookmark
BMP Windows or OS/2 bitmap
BM1 Apogee BioMenace data
BN Instrument bank file (AdLib)
BNK Sound effects bank file (Electronic Arts)
BNK Instrument Bank file (AdLib)
BOL Compressed archive library file (Microsoft Booasm.arc)
BOM Bill of materials file (Orcad Schematic Capture)
BOO Microsoft Booasm.arc Compressed archive
BOOK Adobe FrameMaker Book
BOX Lotus Notes file
BPC Business Plan Toolkit Chart
BPL Borland Delphi 4 packed library
BPS Microsoft Works Document
BPT CorelDraw Bitmap fills file
BPX Truevision Targa Bitmap
BQY BrioQuery file
BR Bridge Script
BRD Eagle Layout file
BRI Basic rate interface file
BRK Brooktrout Fax-Mail file
BRW Application file associated with financial institution(s) loan applications
BRX A file for browsing an index of multimedia options
BRZ DbBRZ file for very large Db backup or restore
BSA BSARC Compressed archive
BSC Apple II Compressed archive
BSC Fortran Pwbrmake Object
BSC MS Developer Studio (MSDev) browser information
BSP Quake map file
BS1 Apogee Blake Stone data file
BS_ Microsoft Bookshelf Find Menu shell extension
BTM Batch file used by Norton Utilities
BTR Database file (Btrieve 5.1)
BUD Backup disk for Quicken
BUG Bugs and Problems file
BUN CakeWalk Audio Bundle (a MIDI program)
BUP Backup
BUT Buttons! Button definition
BUY Movie data file
BV1 WordPerfect for Windows Overflow file below insert point in document 1
BV2 WordPerfect for Windows Overflow file below insert point in document 2
BV3 WordPerfect for Windows Overflow file below insert point in document 3
BV4 WordPerfect for Windows Overflow file below insert point in document 4
BV5 WordPerfect for Windows Overflow file below insert point in document 5
BV6 WordPerfect for Windows Overflow file below insert point in document 6
BV7 Wordperfect for Windows Overflow file below insert point in document 7
BV8 WordPerfect for Windows Overflow file below insert point in document 8
BV9 WordPerfect for Windows Overflow file below insert point in document 9
BW SGI Black and White image file
BW Silicon Graphics Raw red,green and blue bytes file
BWB Visual Baler Spreadsheet application
BWR Kermit Beware buglist
BWV Business Wave file
BYU BYU Movie
BZ Bzip compressed file (Inix)
BZ2 Bzip compressed file (Unix) (replaces Bz)
B1N 1st Reader Mono and color binary screen image
B30 ABC Ventura publisher printer font
B4 Helix Nuts and Bolts file
B8 Raw graphic file (Piclab Plane II)
B_W Atari/Macintosh black and white graphic
B&W Atari/Macintosh black and white graphic
B&W 1st Reader Mono binary screen image

Every file format in the world
C

C C code
C Site configuration for Secure Remote (CheckPoint VPN)
CA Telnet Server Initial cache data file
CAB Microsoft cabinet file (program files compressed for software distribution)
CAC dBase IV Executable file
CAD Softdesk Drafix Cad file
CAG Catalog file (Microsoft Clip Gallery v. 2.x,3.x,4.x)
CAL CALS Compressed Bitmap
CAL SuperCalc 4/5 Spreadsheet
CAL Calendar schedule+ data file (Microsoft)
CAM Casio camera file
CAN Navigator Fax
CAP Ventura Publisher Caption
CAP Compressed music file
CAP Telix Session Capture file
CAR AtHome assistant file
CAS Comma-delimited ASCII file
CAT Quicken IntelliCharge categorization file
CAT dBase Catalogue file
CB Microsoft clean boot file
CBC CubiCalc Fuzzy Logic System file
CBI Column binary file (used in IBM mainframe systems)
CBL Cobol Source code
CBM XLib Compiled Bitmap
CBT Generic Computer based training file
CC Visual dBASE custom class file
CC C++ Source code
CCA cc:mail archive file
CCB Visual Basic Animated Button configuration file
CCC Curtain Call Native bitmap graphic
CCE Data file (Calendar Creator Plus)
CCF Multimedia Viewer configuration file used in OS/2
CCF Symphony Communications Configuration file
CCH Corel Chart
CCL Intalk Communication Command Language
CCM Lotus CC:Mail "box" file (for example, INBOX.CCM)
CCO CyberChat data file
CCO XBTX Graphics
CCT Macromedia Director Shockwave cast file
CDA CD Audio Track
CDB Clipboard file
CDB CardScan Database (CardScan)
CDB TCU Turbo C Utilities Main database
CDB Conceptual model backup file (PowerDesigner)
CDF Netcdf Graphic file
CDFMicrosoft Channel Definition Format
CDFS Compact Disk filing system (WindRiver)
CDI Phillips Compact Disk Interactive file
CDK Atari Calamus Document
CDM Conceptual model file (PowerDesigner)
CDM Visual dBASE custom data module
CDM Conceptual data model file (PowerDesigner Data Architect) (Sybase)
CDR Corel Draw Vector drawing file
CDR Raw Audio-CD data file
CDT Corel Draw template
CDT CorelDraw Data file
CDX Corel Draw compressed drawing
CDX Microsoft's Visual FoxPro index
CE The FarSide Computer Calendar Main CE file
CEG Tempra Show Bitmap graphic
CEL CIMFast Event Language file
CEL AutoDesk Animator Cel Image
CER Certificate file (MIME x-x509-ca-cert)
CF Imake Configurtion file
CFB Comptons Multimedia file
CFG Configuration file
CFL CorelFLOW Chart
CFM ColdFusion template
CFM Visual dBASE Windows customer form
CFM Corel FontMaster file
CFN Atari Calamus Font data file
CFO TCU Turbo C Utilities C form object
CFP The Complete Fax Portable fax file
CGA Ventura Publisher Display font file
CGICommon gateway interface script
CGM Computer Graphic Metafile
CH OS/2 configuration file
CH Clipper 5 Header
CH3 Harvard Graphics 3.0 Chart
CH4 Charisma 4.0 Presentation
CHD FontChameleon Font descriptor
CHF pcAnywhere remote control file
CHI ChiWriter Document
CHK File fragments saved by Windows Disk Defragmenter or ScanDisk
CHK WordPerfect for Windows Temporary file
CHL Configuration History Log
CHM Compiled HTML file
CHN Ethnograph Data file
CHP Ventura Publisher Chapter file
CHR Character Sets (Font file)
CHT ChartViewer file
CHT Harvard Graphics vector file
CHT ChartMaster dBase Interface file
CIF CalTech Intermediate Graphic
CIF Easy CD Creator image
CIF pcAnywhere caller file
CIF Converted image file (Ventura Publisher)
CIL Clip Gallery download package file
CIM Sim City 2000 file
CIM Cimpack design drawing file (CIMEX)
CIN OS/2 change control file that tracks changes to an INI file
CIR Save-file command (SuperMax E-CAD)
CIX TCU Turbo C Utilities Database Index
CKB Borland C++ Keyboard mapping file
CK1 iD/Apogee Commander Keen 1 data
CK2 iD/Apogee Commander Keen 2 data
CK3 iD/Apogee Commander Keen 3 data
CK4 iD/Apogee Commander Keen 4 data
CK5 iD/Apogee Commander Keen 5 data
CK6 iD/Apogee Commander Keen 6 data
CL Generic LISP Source code
CL3 Layout file (Adaptec Easy CD Creator)
CLASS Java class
CLG Disk Catalog database
CLL Cricket Software Clicker File
CLO Cloe Image
CLP Windows Clipboard
CLP Quattro Pro Clip art
CLP Clipper 5 Compiler Script
CLR 1st Reader Binary color screen image
CLR PhotStyler Color defintion
CLS Visual Basic Class Module
CLS C++ Class Definition
CM Craftman Data
CMA Database file in plain text format (APPLIX TM1)
CMD Command file for Windows NT (similar to a DOS .BAT file), OS/2
CMD DOS CP/M command file
CMD dBase-II program file
CMD 1st Reader External Command Menu
CMF Corel Metafile
CFM Creative FM-Music
CMG Chessmaster saved game
CMK Card Shop Plus file
CMM CEnvi Batch file
CMP JPEG Bitmap
CMP Address document
CMP CorelDRAW 4.0 Postscript Printer Header
CMP Route 66 Address Document
CMP Microsoft Word for DOS User dictionary
CMR MediaPlayer Movie
CMU Raster image file (Stereo), (developed by Carnegie Mellon University)
CMV Corel Move animation
CMX Corel Presentation Exchange image
CMYK Raw cyan, magenta, yellow, and black bytes file
CNC CNC General Program data
CNF Configuration file used by Telnet, Windows, and other applications with varying internal formats
CNM Windows application menu options and setup file
CNQ Compuworks Design Shop file
CNT Windows (or other) system content files for the help index and other purposes
CNV Word for Windows Data conversion support file
CNV WordPerfect for Windows Temporary file
CNV Conversion files (WS_FTP Pro) files that will be converted from (Example) "HTML-"HTM" for upload
COB trueSpace 2 object
COB COBOL Source code
COD Microsoft C compiler output as displayable machine language/assembler with original C as comments
COD FORTRAN Compiled code
COD dBase Application Generator Template source file
COD Video Text file
COL AutoDesk Animator Color Palette
COL Microsoft Multiplan Spreadsheet
COM Command file (program)
CON Simdir Configuration file
CP8 CP8 256 Gray Scale image
CPD Corel PrintOffice file (drawing)
CPD Fax Cover document
CPD Complaints Desk Script
CPE Fax Cover document
CPF The Complete Fax (Fax file)
CPH Image file (Corel Print House) see CPO
CPI Microsoft MS-DOS code page information
CPI ColorLab Processed Image bitmap
CPJ CeQuadrant CD Project
CPL Control Panel Module
CPL Compel Presentation
CPL Corel color palette
CPO Image file (Corel Print Office)
CPP C++ Source code
CPP CA-Cricket Presents presentation
CPR Corel Presents presentation
CPS Central Point PC Tools Backup
CPS Coloured postscript
CPT Corel Photo-Paint image
CPT Macintosh Compressed Archive
CPT dBase Encrypted Memo
CPT CA-Cricket Presents Template
CPX Corel Presentation Exchange compressed drawing
CPY Data file (Copy Books)
CPZ COMPOZ Music Text
CRC Circular reference file (Pro/Engineer)
CRC Check file (Win-SFV32) (Fantasia Software)
CRD Microsoft Windows 3.x Cardfile
CRF Zortech C++ cross-reference
CRH Image file (Microsoft Golf)
CRP Corel Presents run-time presentation
CRP Visual dBASE custom report
CRP dBase IV Encrypted database
CRS WordPerfect 5.1 for Windows File Conversion resource
CRT Certificate file
CRT Oracle Terminal settings information
CRT Crontab file)
CRU CRUSH Compressed archive
CSA Comma deliminated text
CSC Corel script
CSG Statistica/w Graph file
CSH C shell script files (Hamilton Labs)
CSM Borland C++ 4.5 Precompiled header
CSM Script file (Kodak Dc265 Camera)
CSO Customer service data and outcome file
CSP PC Emcee On-Screen image
CSS Stats+ Datafile
CSS Statistica/w Datasheet
CSSCascading Style Sheet (MIME)
CST Macromedia Director "Cast" (resource) file
CSVComma-separated values file
CSV CompuShow Adjusted EGA/VGA Palette
CT Scitex CT bitmap
CT A graphic file associated with the Paint Shop Pro Graphic Editor
CTC PC Installer Control
CTF Symphony Character code translation
CTL Used in general for files containing control information. FAXWorks uses it to keep information about each fax sent and received.
CTL dBase IV Control
CTX Visual Basic User control binary file
CTX Pretty Good Privacy (PGP) Ciphertext file
CTX Microsoft Online Course Text
CUE Microsoft Cue Cards data
CUL Cursor library file (IconForge)
CUR Windows Cursor
CURSOR Sun Microsystems Cursor
CUT Dr Halo Bitmap
CV Corel Versions archive
CV Microsoft CodeView information screen
CVG Image
CVS Canvas drawing file
CWK Claris Works data
CWS Claris Works template
CXT Macromedia Director protected (not editable) "Cast" (resource) file
CXX C++ source code
C-- Sphinx C-- Source code
C00 Ventura Publisher Print file
C01 Typhoon wave
C86 Computer Innovation (C86) Source code

Every file format in the world
D

DAO Windows Registry Backup
DAP Data access page (Microsoft Access 2000)
DAT Data file
DAT A data file extension used to designate an error message in a inbound internet email message (Microsoft Exchange Server v 5.0)
DAT WordPerfect Merge Data
DAT Extension used for some MPEG files
DB Borderland's Paradox 7 table database
DBC Microsoft's Visual FoxPro database container file
DBF A dBASE file, a format originated by Ashton-Tate, but understood by Act!, Clipper,FoxPro, Arago, Wordtech, xBase, and similar database or database-related products.
DBF Enable database (can be opened with Excel 97)
DBF Oracle 8.1.x tablespace file
DBK dBase Database Backup
DBK Schematic backup file (Orcad Schematic Capture)
DBO Compiled program file (dBase IV)
DBQ Paradox Memo
DBT dBase Text Memo
DBV Memo field file (Flexfile 2)
DBW Microsoft Windows 9.x Database file (DataBoss)
DBX DataBeam image
DBX Microsoft's Visual Foxpro Table file
DC CAD file (DesignCAD)
DC2 CAD file (DesignCAD)
DCA Document Content Architecture Text file (IBM DisplayWrite)
DCA Visual Basic Active designer cache
DCD Document content description file (used in XML)
DCF Disk Image file
DCF Data file (Dyadic)
DCIM Digital Imaging and Communications in Medicine (image and data)
DCM DCM module
DCP Data CodePage (OS/2)
DCR Shockwave file
DCS Desktop Color Separation file
DCS Bitmap Graphics (Quark XPress)
DCS Datafile (ACT! Activity file)
DCT Microsoft's Visual FoxPro database container file
DCT Database Dictionary file (Clarion Database Developer)
DCT Database SpellCheck Dictionary (Harvard Graphics 3.0-Symphony)
DCU Delphi compiled unit
DCX Microsoft's Visual FoxPro database container file
DCX Fax image (based on PCX)
DCX Macro file
DCX Bitmap Graphics file (Multipage PCX)
DC5 DataCAD Drawing
DD Compressed Archive (Macintosh DISKDOUBLER)
DDB Bitmap Graphics file
DDF Btrieve or Xtrieve Data Definition File, which contains metadata describing a Btrieve or Xtrieve file
DDI Image File (DISKDUPE)
DDIF Digital Equipment or Compaq file. Used for storing images and their word processing documents
DDP Device Driver Profile (OS/2)
DEB Debug Script (DOS Debug)
DEF SmartWare II data
DEF Define Module file (3-D Fassade Plus)
DEF C++ definition file
DEF Assembly Header file (Geoworks)
DEFI Oracle 7 de-install script
DEI Design Engineered Interface (GSI), Gerber Systems Inc.)
DEM Demo file (Descent)
DEM A file with USGS standards for Digital Elevation Models (Vista Pro)
DEM Graphics file (Vista Pro)
DEP Visual Basic Setup Wizard Dependency file
DER Certificate file
DEV Device Driver
DEWF Macintosh SoundCap/SoundEdit recorded instrument file
DEZ Encrypted zip file (DES Encryption)
DFD Data Flow Diagram Graphic (Prosa)
DFI Outline Font description (Digifont)
DFL Default Program Settings (Signature)
DFM Data Flow Diagram model (Prosa)
DFS Sound File (Delight)
DFV Printing Form value (Microsoft Word)
DGN Microstation95 CAD drawing
DGS Diagnostics Report
DH Dependency Information file (Geoworks)
DHP Graphic file (Dr. Halo II-III PIC Format)
DHT Datafile (Gauss)
DIA Diagraph Graphics file (Computer Support Corporation)
DIB Device-independent bitmap
DIC Dictionary file
DIC Dictionary file (Lotus Notes, Domino)
DICM Digital imaging and communications in medicine file (DICOM)
DIF Data Interchange Format spreadsheet
DIF Database file (VisiCalc)
DIF Data Interchange Output file
DIF Text file (Output from Data Interchange Format)
DIG Digilink file
DIG Sound Designer I audio
DIP Graphics file
DIR Macromedia Director file
DIR Dialing Directory (ProComm Plus)
DIR Directory (VAX) (DEC)
DIR Movie (MacroMind Director 4.x)
DIS Ray Tracer file
DIS Distribution file (VAX Mail)
DIS Thesaurus file (CorelDraw)
DIT Active directory schema (Microsoft Windows 2000)
DIZ Description file (Description in ZIP)
DKB Graphics file (Ray Traced DKBTrace)
DL Image
DLD Datafile (Lotus 1-2-3)
DLG C++ Dialogue Script
DLLDynamic-link library file
DLL Export/Import Filter (CorelDraw)
DLS Downloadable sound
DLS Interactive music architecture (IMA)(Microsoft),(Blood2)
DLS Setup file (Norton DiskLock)
DMD Visual dBASE data module
DMF Packed Amiga disk image
DMF X-Trakker music module (MOD)
DMO Demo file (Derive)
DMP Dump file (Screen or Memory)
DMS Compressed Archive (Amiga DISKMASHER)
DOB Visual Basic User document
DOC FrameMaker or FrameBuilder document
DOC WordStar document
DOC WordPerfect document
DOC Microsoft Word document
DOC DisplayWrite document
DOC Document format (Interleaf)
DOG Screen Saver file (Laughing Dog Screen Saver)
DOH Dependency Information file (Geoworks)
DOS External Command file (1st Reader)
DOS Network Driver file (PKT_DIS.dos)
DOS Text file (DOS)
DOT Word Document Template (Microsoft Word for Windows)
DOT Line-Type definition (CorelDraw)
DOX User document binary form (Visual Basic)
DOX Text file (MultiMate 4.x)
DOZ Description out of Zip (VENDINFO)
DP Calendar file (Daily Planner)
DP Datafile (DataPhile)
DPJ DeskProto project file (DeskProto CAM)
DPL Borland Delphi 3 packed library
DPR Project header (Borland C++)
DPT Publication file (Publish-It!)
DRAW Acorn's object-based vector image
DRC Design rules check report file (Orcad Schematic Capture)
DRS Display Resource file (Microsoft WordPerfect for Windows)
DRV Driver
DRV Device Driver (Required to make a device function)
DRW Vector graphics (Micrografx)
DRW Lotus Freelance Image
DRW Pro/E drawing
DS4 Micrografx Designer Image
DR9 Directory file
DS4 Vector Graphics (Micrografx)
DSC Discard file (Oracle)
DSD Database file (DataShaper)
DSD Document structure definition file (Used in XML)
DSF Micrografx Designer v7.x file
DSG DooM saved game
DSK Project Desktop file (Borland C++/Turbo Pascal)
DSK Driver file (Novell Netware)
DSM Dynamic Studio music module (MOD)
DSM Digital Sound Module (DSI)
DSM Music module file (DSIK)
DSN ODBC Data source
DSN Design (Object System Designer)
DSN Schematic file (Orcad Schematic Capture)
DSP Microsoft Developer Studio project
DSP Display parameters (Signature)
DSP Graphics Display driver (Dr. Halo)
DSQ Corel QUERY
DSR Visual Basic Active designer file
DSR Driver Resource (Microsoft WordPerfect for Windows)
DSS Screensaver file (DCC)
DSS Digital Sound file (Digital Soup))
DST Embroidery machines graphic file
DST Distribution file (PC-RDist, by Pyzzo)
DSW Desktop settings (Borland C++ 4.5)
DSW Microsoft Developer Studio workspace file
DSX Visual Basic Active designer binary file
DT_ Data file fork (Macintosh)
DTA World Bank's STARS data
DTA Datafile (Turbo C++)
DTD SGML Document Type Definition (DTD) file
DTED Digital terrain elevation data (geographic data format)
DTF Database file (PFS-Questions & Answers)
DTF Symantec Q&A relational database
DTM Module file (DigiTrakker)
DTP Desktop layout file (SecurDesk!/SecurDesk! LV)
DTP Text Document (Timeworks Publisher 3.x)
DTP Template file (Pressworks)
DUN Microsoft Dial-up Networking Export file
DUP Duplicate Backup
DV Digital video (MIME)
DVC Datafile (Lotus 1-2-3)
DVF Graphics file associated with camcorders (DV Studio)
DVI Binary file (TeX)
DVI Device Independent Document (TeX) (LaTeX)
DVP Desqview Program information (DESQview)
DVP Device parameter file (AutoCAD)
DW2 Drawing file (DesignCAD for Windows)
DWC Compressed Archive (DWC)
DWD DiamondWare digitized file
DWF Vector graphic (Autodesk)
DWF CAD drawing in Vector Graphics format
DWF Drawing Web file (Microsoft WHIP autoCAD reader)
DWG AutoCAD Drawing
DWG AutoCAD drawing, or older Generic CAD drawing file
DWP Document file (DeScribe)
DWS Workspace file (Dyadic)
DWT Template file, or prototype (AutoCAD)
DX Digital Electric Corporation (DEC) Data exchange file
DXF Drawing Interchange (eXchange) format,a text representation of the binary DWG format
DXF Drawing Interchange Format (AutoCAD)
DXF Data Exchange File
DXN Fax document (Fujitsu dexNet)
DXR Macromedia Director protected (not editable) movie file
DYN Datafile (Lotus 1-2-3)
D2D 2D/3D object file (3-D Fassade Plus)
D64 Commodore 64 emulator disk image

Every file format in the world
E
e00 Exchange file (Arc/Info)
EBJ Error Checking Object file (Geoworks)
ED5 EDMICS image
ED6 EDMICS image
EDA Ensoniq ASR disk image
EDB ROOTS3 Geneological data file
EDE Ensoniq EPS disk image
EDD Element Definition document (FrameMaker+SGML documents)
EDK Ensoniq KT disk image
EDQ Ensoniq SQ1/SQ2/KS32 disk image
EDS Ensoniq SQ80 disk image
EDT Default settings (VAX Edt editor)
EDV Ensoniq VFX-SD disk image
EEB Button Bar for Equation editor (Microsoft WordPerfect for Windows)
EFA Ensoniq ASR file
EFE Ensoniq EPS file
EFK Ensoniq KT file
EFQ Ensoniq SQ1/SQ2/KS32 file
EFS Ensoniq SQ80 file
EFT High Resolution Screen Font (ChiWriter)
EFV Ensoniq VFX-SD file
EFX Fax Document (Everex EFax)
EFX Fax document (Efax Reader)
EGA EGA Display font (Ventura Publisher)
EKM Keyboard macro definitions file (EXP: The Scientific Word Processor)
EL Lisp Source code (eMacs)
ELC eMac Lisp Source code (byte-compiled)
ELM Theme-Pack file for (Microsoft FrontPage)
ELT Event List Text file (Prosa)
EMB Embedded bank File (Everest)
EMD ABT Extended MoDule
EMF Enhanced Windows Metafile
EML Microsoft Outlook Express mail message (MIME RFC 822)
EMS Enhanced Menu System Configuration file (PC Tools)
EMU Terminal Emulation Data file (BITCOM)
ENC Music file (Encore)
ENC Video file
ENC Encoded file (UUENCODEd File, Lotus 1-2-3)
END Arrow-Head Definition Table (CorelDraw)
ENFF Neutral Format
ENG Dictionary Engine file (Sprint)
ENG Chart Graphics file (EnerGraphics)
ENV Enveloper Macro (WOPR)
ENV Environment file (Microsoft WordPerfect for Windows)
EPD Publication file (Express Publisher)
EPHTML Enhanced Perl-parsed HTML
EPI Document file (Express Publisher)
EPS Encapsulated Postscript Vector graphics (Adobe Illustrator)
EPS Printer font (Epson, Xerox, Ventura Publisher)
EPS2 Adobe Level II Encapsulated Postscript
EPS Encapsulated PostScript image file
EPSF Encapsulated PostScript
EPSI Adobe Encapsulated Postscript Interchange
EQN Equation file (Microsoft WordPerfect for Windows)
ER1 ERWin file
ERD Entity Relationship Diagram graphic file (Prosa)
ERM Entity Relationship Diagram Model file (Prosa)
ERR Stores the error messages that result when the RoboHELP Help Compiler attempts to compile the source files of a Help system
ERR Compilation error file (Microsoft Visual FoxPro)
ERX ERWin file
ESF Audio file (Emblaze)
ESH Extended Shell Batch file (DOS)
ESL Distributable support library file (Microsoft Visual FoxPro)
ESPS ESPS audio file
ESS Style sheet (EXP: The Scientific Word Processor)
ETH Document file (Ethnograph 3.x)
ETX Structure Enhanced text (SetText)
EUI Ensoniq ESP family compacted disk image
EVT Event Log (Microsoft Windows NT, 2000)
EVY Document (Microsoft Wordperfect for Windows Envoy)
EWD Text Document (Express Publisher for Windows)
EWL Microsoft Encarta document
EXT2 Second extended file system (Linux)
EXT3 Third extended file system (Linux)
EX3 Device Driver file (Harvard Graphics 3.x)
EXC Microsoft Word Exclusion Dictionary file
EXC Source Code file (Rexx VM/CMS)
EXC Exclude file for Optimize (do not process, QEMM)
EXE Executable file (program)
EXP Saved chat (ICQ)
EXT ASCII binary transfer file (WS_FTP PRO) (IPSWITCH Software)
EZP Compressed file (Edify.zip) (Edify Electronic Workforce Backup Utility)
E00 Coverage export file (ArcInfo)

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This list was most recently updated by Kent Pilarski. (Other contributors to this list are mentioned on our Credits page.)
Last updated on June 15, 2000

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