List of filename extensions (A–E)

This alphabetical list of filename extensions contains extensions used by multiple notable applications or services.

Main article: List of filename extensions

A
Ext.DescriptionUsed by
A archive file ar (Unix)
ACCDB[1] Microsoft Access Database Microsoft Access Database (Open XML)
ACCFT[2] Microsoft Access Data Type Template Microsoft Access
ADAM Adam Ransomware file Adam Ransomware
ADICHT LabChart data acquisition file ADInstruments
ADT Abrechnungsdatentransfer, an xDT application Healthcare providers in Germany
ADX Document Archetype Designer
ADZ Amiga Disk Zipped (See Amiga Disk File) GZip
AGR ArcView ASCII grid
AHK AutoHotkey script file AutoHotkey
AI[3] Adobe Illustrator Artwork Adobe Illustrator
AIFF Audio Interchange File Format Convert (c) Villena
AIO APL programming language file transfer format file
AIR Adobe AIR installation package The Adobe AIR runtime environment
AKM "Akai Multitimbral" sample information file Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
AKP "Akai Program" sample information file Akai S5000 and S6000 hardware samplers (MS-DOS-based) and compatible software samplers
ALC Molecular coordinates Alchemy, RasMol
ALE Avid Log Exchange (used in film & video editing) Avid
ALL General printer information WordPerfect for Win
AMF[4][5] Additive Manufacturing File Format Computer Aided Design Software
AMG System image file ACTOR
AML[6] AutomationML AutomationML Group
AMLX[6] Compressed and packed AutomationML file AutomationML Group
AMPL AMPL source code file AMPL
ANI[7] Animation cursors for Win Win95 - WinNT
ANN Annotations of old Windows Help file Windows 3.0 - XP
APE Monkey's Audio (Lossless) audio media players
APK Android Package Kit Android
AR Argon - for 3D Modeling Ashlar-Vellum
ARC[8] ARC (file format)
ART[9] Gerber format Cadence Allegro, EAGLE
ASAX[10] ASP.NET global application file
ASCX[10] ASP.NET User Control
ASF[11] Advanced Streaming Format (Compressed Windows audio/video) Microsoft Corporation
ASHX ASP.NET handler file[10]
ASM Assembler language source TASM, MASM, NASM, Yasm, FASM
ASX[12] Advanced Stream Redirector file, redirects to an ASF file (see ASF) Microsoft Corporation
AT3[13] Atrac 3 Sound/music file All Sony devices and programs with the Atrac 3+ specification
ATY Produced when an association type is exported by 3D Topicscape 3D Topicscape
AVI[14][15] Audio Video Interleave Video for Windows
AWK AWK script/program awk, GNU Awk, mawk, nawk, MKS AWK, Awka (compiler)
AXF[16] "lightweight geodatabase" ESRI ArcPad
AEP After effects project Adobe After Effects

B
Ext.DescriptionUsed by
B BASIC language source or Grand Theft Auto 3 save file
B bc arbitrary precision calculator language file Unix bc tool
BAR Broker Archive. Compressed file containing number of other files for deployment.[17] IBM WebSphere Message Broker
BAS BASIC language source QuickBASIC - GW-BASIC - FreeBASIC - others
BAT Batch file MS-DOS, RT-11
BDT Behandlungsdatentransfer, an xDT application Healthcare providers in Germany
BEAM Executable bytecode file in fat binary format BEAM (Erlang virtual machine)[18]
BM3 UIQ3 Phone backup
BMP[19] OS/2 or Win graphics format (BitMap Picture) QPeg - CorelDraw - PC Paintbrush - many
BPS WPS backup file[20] Microsoft Word, Microsoft Works
BZ2[21] Archive bzip2
BLEND Blender project file Blender

C
Ext.DescriptionUsed by
C-- C-- language source Sphinx C--
C C language source

Note that on case-sensitive platforms like Unix and with the gcc compiler the uppercase .C extension indicates a C++ source file.[22]

 Watcom C/C++, Borland C/C++, gcc and other C compilers
C Unix file archive COMPACT
C++ C++ language source
C32 COMBOOT Executable (32-bit) SYSLINUX
CAB[23] Cabinet archive Windows 95 and later, many file archivers
CBT COMBOOT Executable (incompatible with DOS COM files) SYSLINUX
CD ASP.NET class diagram file[10]
CDF[24] Common Data Format
CDF[25] Computable Document Format Mathematica
CDR[26] Vector graphics format (drawinF CorelDraw
CER[27] Security certificate Microsoft Windows
CGM[28][29] Computer Graphics Metafile vector graphics A&L - HG - many
CHM[30] Compiled Help File Microsoft Windows, Help Explorer Viewer
CHO[31] ChordPro lead sheet (lyrics and chords) ChordPro and similar tools
CIA Decrypted Nintendo 3DS ROM cartridge Nintendo 3DS
CIF[32][33] Crystallographic Information File RasMol, Jmol
CLASS[34] Java class file Java
CMD Command Prompt batch file Microsoft Windows NT based operating systems
CMD[35] executable programs CP/M-86 operating system
CMOD[36] Celestia Model Celestia
CN1[37] CNR IDL MITRE
COE[38] Coefficient file Xilinx ISE
COMPILE[10] ASP.NET precompiled stub file
COPAC Copac bibliographic reference file
CPC[39] Compressed image Cartesian Perceptual Compression
CPL[40] Control panel file Windows 3.x
CR2[41] Raw image format Canon digital cameras
CRAI[42] CRAM index
CRDOWNLOAD Chrome download file Google Chrome
CRT[27] Security certificate Microsoft Windows
CSPROJ[43][44] C# project file Microsoft Visual Studio
CSS[45] cascading style sheet
CSV[46] Comma Separated Values text file format (ASCII)

D
Ext.DescriptionUsed by
D D Programming Language source file DMD
D Directory containing configuration files (informal standard) Unix
D3V Video file Nintendo DS (with ARME, MMCF etc.)
D4D Data Draw 4D object
D4P Data Draw 4D Pro object
D64 Commodore 64 disk image
D88 Toshiba Pasopeia D88 disk image format A series of emulators of Japanese computers
DAA Direct Access Archive
DAE COLLADA file
DAF Data file Digital Anchor
DAL Digidim system Helvar Digidim Toolbox
DAT AMPL data file AMPL
DAT Maxum chromatograph chromatogram Siemens Maxum Chromatograph
DAT LDraw (Sub)Part File, 3D Model LDraw
DAT Document Microsoft Word Format (old)
DAT data RSNetWorx Project
DAT Data file in special format or ASCII
DAT Database file Clarion (programming language)
DAT Norton Utilities disc image data. It saves Boot sector, part of FAT and root directory in image.DAT on same drive. Norton Utilities
DAT Optical disc image (can be ISO9660, but not restricted to) cdrdao, burnatonce
DAT Video CD MPEG stream
DAT Windows registry hive (REG.DAT Windows 3.11; USER.DAT and SYSTEM.DAT Windows 95, 98, and ME; NTUSER.DAT Windows NT/2000/XP/7) Microsoft Windows
DAT Minecraft game data Minecraft
DATS Dynamic source ATS
DAV Proprietary DVR format Recorded encrypted video from digital video recorders DVR365 or AlienDVR series[47]
DB$ Temperature debug info Clarion Modula-2
DB$ Temporary file dBASE
DB Database file Paradox - XTreeGold - dbvista - Oracle - XoftSpySE - Windows thumbnail cache[48][49]
DB Configuration dBASE IV - dBFast
DB Multi Edit config ME
DB2 Database dBASE II
DB3 Database dBASE III
DBA Database file Turbo Prolog - DataEase
DBA DarkBasic source code
DBC DataBaseContainer Visual FoxPro
DBD Business data Business Insight
DBD Debug info Clarion Modula-2
DBF Database file dBASE III/IV - Visual FoxPro - dBFast - DataBoss - DBVista - CA-Clipper - Visual Objects - Alaska Xbase++ -

Advantage Database Server

DBFX DevBox Database File Pudince Devbox
DBG Debugger script DOS debug - Watcom debugger
DBG Symbolic debugging information Microsoft C/C++
DBK Database backup dBASE IV
DBL DIBOL source file
DBL Design Block file EAGLE
DBM Datafile DataEase
DBM Menu template DataBoss
DBO Compiled program dBASE IV
DBPro DarkBasicPro Project
DBS Data file used by Managing Your Money
DBS Database in SQL Windows format
DBS Datafile PRODAS
DBS Printer description file Microsoft Word, Microsoft Works
DBT FoxBASE+ style memo FoxPro 2.x
DBT Memo file for database w/same name dBASE IV - dBFast
DBW Windows file DataBoss
DBX DataBeam GCGW
DBX AutoCAD Database AutoCAD
DBX Archive File Outlook Express
DC CAD drawing file DesignCAD 3000 for Windows
DC6 Image file Diablo II
DCA Document Content Architecture text file IBM DisplayWrite
DCC Animation Diablo II
DCD CAD Drawing File DesignCAD 3DMax for Windows
DCH Schematic Drawing file DipTrace Schematic Capture
DCI Dreamcast Save File Dreamcast
DCL Delphi Control Library Borland Delphi
DCM DCM music module AWAVE
DCP OS/2 device code page OS/2
DCS Bitmap graphics (CYMK format) QuarkXPress
DCS Datafile ACT! Activity Files
DCT Dictionary: used by many programs with program dependent format Clarion
DCT Spell checking dictionary Harvard Graphics 3.0 - Symphony
DCT DataBaseContainer Extension Visual FoxPro
DCU Delphi unit (compiled) Borland Delphi
DCW Walter Machine Programing Walter Profile Editor
DCX Multi-page PCX graphics (common fax format) Intel - SpectraFAX
DCX DataBaseContainer Index Visual FoxPro
DD Macintosh file archive DiskDoubler
DDA Data GLBasic ASCII 3D object
DDB Bitmap graphics
DDB Digidesign Database File Digidesign Pro Tools
DDD Building Diagram Diagramming software
DDI Disk image DiskDupe
DDP Device Driver Profile file OS/2
DDS DirectDraw Surface file Microsoft Flight Simulator, other Microsoft programs
DEB Unix archive file (software package format) Unix
DEB DEBUG script DOS Debug
DEF Assembly header file Geoworks
DEF Defaults - definitions
DEF Linker definition file TLink - WLink...
DEM Demonstration
DEM Digital Elevation Model
DEM Graphics file VistaPro
DEM Vista DEM file Meta.exe VP3
DER Security certificate Microsoft Windows
DES Ascii text parameter description AWAVE
DESKLINK Windows Explorer Desktop Control (commonly "Desktop (create shortcut).DESKLINK", 0 bytes). Uses a 'special' hidden file extension (NeverShowExt flag inside the Registry), overriding the Windows Explorer option of showing/hiding file extensions.
desktop Desktop Entry freedesktop.org
DEV Device driver
DEV SYSGEN handler build procedure RT-11
DEV Dev-C++ project file Dev-C++
DEX Dalvik executable Android
DFD Data Flow Diagram graphic file Prosa
DFF RenderWare model data (e.g. Grand Theft Auto III and later)
DFF Audio file created by converting the audio format from an SACD. Normally found on torrenting sites like The Pirate Bay.
DFI Outline font description Digifont
DFL Default program settings Signature
DFM Data Flow Diagram model file Prosa
DFM Delphi form module Borland Delphi
DFPWM Dynamic Filter Pulse Width Modulation (audio codec) Java (specifically, the Computronics

modification for Minecraft)

DFS Delight Sound File
DFTI Dynamic Formatted Text and Images (Word Processing) FlexiWrite
DFV Printing form (Word) Microsoft Word
DFX Micrografx Effects DLL
DGN Graphics file MicroStation
DGS Diagnostics
DH Dependency information for .ph Geoworks
DHP Dr. Halo PIC Format graphics file Dr. Halo II - III
DHT Datafile Gauss
DI D Programming Language interface file DMD
DIA Diagraph graphics file Computer Support Corporation
DIB Device Independent Bitmap rarely used Windows 3.0 bitmap; Win - OS/2
DIC Dictionary (e.g. from WinWord)
DICOM Digital Imaging and Communications in Medicine (DICOM) bitmap DICOM Software (XnView)
DIF Borland patch data file Borland patch
DIF Data Interchange Format Visicalc
DIF OS/2 V2.2 Display Information File OS/2
DIF Output from Diff command - script for Patch command
DIF SRCCOM, BINCOM output file RT-11
DIG Digilink AWAVE
DIG Sound Designer 1 audio file AWAVE
DIP Graphics
DIP Watcom debug info processor WatcomDebugger
DIP PCB Drawing file DipTrace PCB Layout
DIR Dialing directory file Procomm Plus
DIR Directory file VAX - CPS Backup
DIR Movie MacroMind Director 4.x
DIR Directory listing file RT-11
DIRED Directory listing (ls format) Dired
DIS Distribution file VAX Mail
DIS Thesaurus CorelDraw
DIZ Description file (Description In Zip)
DJVU DJVU Document Format, a format similar to PDF but with higher compression rates at the same quality. DJVU
DKB Raytraced graphics DKBTrace
DL Animation format (Italian origin) Display - DL Viewer
DLC JDownloader Link Container JDownloader
DLD Lotus 1-2-3
DLF Dialogue Live Format Produced by Exstream Dialogue and edited by Dialogue Live Editor
DLG Dialog resource script file Microsoft Windows SDK
DLG Dialog resources DN
DLG Windows SDK dialog editor data file
DLG Windows SDK dialog editor data file
DLL Dynamic-link library Windows 3.x - OS/2
DLL Export/import filter CorelDRAW
DLM Microsoft File Transfer Manager Microsoft File Transfer Manager
DLP Data DAQLab
DLS Setup Norton Disklock
DMF Music format (Delusion Digital Music File) Delusion
DMF DeleD files
DMG Apple Disk Image Mac OS X (Disk Utility),
DMO Demo Derive
DMP Dump file (e.g. screen or memory)
DMP DUMP utility output file RT-11
DN Dimension model format Adobe Dimension [50]
DNG[51] Digital Negative, a-publicly available archival format for the raw files generated by digital cameras At least 30 camera models from at least 10 manufacturers, and at least 200 software products
DOC[52][53][54] A Document, or an ASCII text file with text formatting codes in with the text; used by many word processors Microsoft Word and others
DOCM Microsoft Word Macro-Enabled Document Microsoft Word
DOCX Microsoft Word Document Microsoft Word[55]
DOCHTML Microsoft Word HTML Document Microsoft Word
DOCMHTML Microsoft Word MIME HTML Document Microsoft Word
DOT Microsoft Word 97 - 2003 Template Microsoft Word
DOTM Microsoft Word Macro-Enabled Template Microsoft Word
DOTX Microsoft Word Template Microsoft Word
DOTHTML Microsoft Word HTML Template Microsoft Word
DOF Delphi project options file Borland Delphi
DOG Screen file Laughing Dog Screen Maker
DOH Dependency information for .poh Geoworks
DOL Nintendo Wii and GameCube proprietary executable format Nintendo Wii and GameCube games and software
DOR Roland Digital audio file Roland
DOT Microsoft Word document template Microsoft Word
DOTX Office Open XML Text document template Microsoft Word
DOWNLOAD Download file Safari, Edge
DPF Debrief Plot File Debrief
DPX[56][57] Digital Moving Picture Exchange
DRU Design Rules EAGLE
DS Data file used by Adobe Dimension
DSC[58] Celestia Deep Space Catalog file Celestia
DTD[59] Document Type Definition
DVC Data version control yaml pointer into blob storage "Data Version Control".
DW2 Drawing DesignCAD for DOS, & DesignCAD for Windows
DWF Autodesk Design Web Format Design Review
DWG[60] Drawing AutoCAD, IntelliCAD, PowerCAD, Drafix, DraftSight etc.
DXF[61] Drawing Interchange File Format vector graphics AutoCAD, IntelliCAD, PowerCAD, etc.
DXP SpotFire data TIBCO Spotfire

E
Ext.DescriptionUsed by
E E language source code E
E## EnCase Evidence File chunk EnCase Forensic Analysis Suite entity
E00 ArcInfo interchange file GIS software
E2D 2-dimensional vector graphics file Editor included in JFire
e57 A file format developed by ASTM International for storing point clouds and images Most software that enables viewing and/or editing of 3D point clouds
EBD versions of DOS system files (AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS, WINBOOT.SYS, etc. ) for an emergency boot disk Windows 98, ME
EC Source code eC
ECC Error-checking file dvdisaster
EDE Ensoniq EPS disk image AWAVE
EDF European data format Medical timeseries storage files
EFI Extensible Firmware Interface
EIS EIS Spectrum Analyser Project EIS Spectrum Analyser
EL Emacs Lisp source code file Emacs
ELC Byte-compiled Emacs Lisp code Emacs
EMAIL Outlook Express Email Message Windows Live Mail, Outlook Express, Microsoft Notepad
EMAKER E language source code (maker) E
EMF Microsoft Enhanced Metafile
EML Stationery Template Outlook Express
EMZ Microsoft Enhanced Metafile compressed with ZIP Microsoft Office suite
EOT Embedded OpenType
EP GUI wireframe/prototype project Prikhi Pencil, Evolus Pencil
EPA Award BIOS splash screen Award BIOS, XnView
EPS Encapsulated PostScript CorelDraw - PhotoStyler - PMView - Adobe Illustrator - Ventua Publisher
EPUB Electronic Publication - (e-Reader format) Okular (Linux) - Apple iBooks - Sony Reader - Adobe Digital Editions - Calibre (LMW)
ERL Erlang source code file
ES6 ECMAScript 6 file
ESCPCB Data file of "esCAD pcb", PCB Pattern Layout Design Software esCAD pcb provided by Electro-System
ESCSCH Data file of "esCAD sch", Drawing Schematics Diagram Software esCAD sch provided by Electro-System
ESD Windows Imaging Format ImageX, DISM, 7-Zip, wimlib
ETL event trace log file Microsoft[62][63]
EVT Windows Event log file Microsoft Windows NT 4.0 - XP; Microsoft Event Viewer
EVTX Windows Event log file XML structured Microsoft Windows Vista, 7, 8; Microsoft Event Viewer
EX Elixir source code file Elixir programming language running on BEAM (Erlang virtual machine)[64]
EXE Directly executable program DOS, OpenVMS, Microsoft Windows, Symbian or OS/2
EXP Drawing File format Drawing Express
EXP Melco Embroidery Format Embroidermodder
EXS Elixir script file Interactive Elixir (IEx) shell[65]
EZW easyOFFER document file[66] easyOFFER by Reagency Systems Corp.

See also

References
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