This alphabetical list of filename extensions contains extensions of notable file formats used by multiple notable applications or services.
A Ext. Description Used byAArchive filear (Unix) Advanced Audio fileYouTube Music Advanced Audio Coding fileiOS, Nintendo DSi, Nintendo 3DS, YouTube Music Microsoft Access DatabaseMicrosoft Access Database (Open XML) Microsoft Access Data Type TemplateMicrosoft Access Adobe color palette format (.aco)Adobe Photoshop Abrechnungsdatentransfer, an xDT applicationHealthcare providers in Germany DocumentArchetype Designer Amiga Disk Zipped (See Amiga Disk File)GZip Agda (programming language) source fileAgda typechecker/compiler ArcView ASCII grid AutoHotkey script fileAutoHotkey Adobe Illustrator ArtworkAdobe Illustrator Audio Interchange File Formatprofessional audio processing applications and on Macintosh Compressed Audio Interchange File Format APL programming language file transfer format file Specification for Data Exchange Format for Additive ManufacturingSpecification of AMF on ISO web pageAdditive Manufacturing File FormatComputer Aided Design Software System image fileACTOR AutomationMLAutomationML Group Compressed and packed AutomationML fileAutomationML Group AMPL source code fileAMPL Adaptive Multi-Rate audio Actions Media Video Animation cursors for WinWin95 - WinNT Annotations of old Windows Help fileWindows 3.0 - XP Monkey's Audio (Lossless)audio media players Android application packageAndroid Alpine Linux Package Alpine Linux and derivatives ARC (file format) Gerber formatCadence Allegro, EAGLE Sony Alpha RAW image format Sony ASP.NET Web Project File TypesASP.NET global application file ASP.NET User Control Advanced Streaming Format (Compressed Windows audio/video)Microsoft Corporation ASP.NET handler file Assembler language sourceTASM, MASM, NASM, FASM Active server page extended fileMicrosoft Corporation Advanced Stream Redirector file, redirects to an ASF file (see ASF)Microsoft Corporation Coco/R LL(1) formal grammar Coco/R Atrac 3 Sound/music fileAll Sony devices and programs with the Atrac 3+ specification audio file Audio Video Interleave Video for Windows AV1 Image File Format AWK script/programawk, GNU Awk, mawk, nawk, MKS AWK, Awka (compiler) DirectShow Filter Microsoft Corporation (Video Players) lightweight geodatabaseESRI ArcPad
B Ext. Description Used byBBASIC language sourceBASICBbc arbitrary precision calculator language fileUnix bc tool base64 binary-to-text encoding backupvarious FMOD asset fileFMOD Broker Archive. Compressed file containing number of other files for deployment.IBM App Connect BASIC language sourceQuickBASIC - GW-BASIC - FreeBASIC - others Batch fileMS-DOS, RT-11, DOS-based command processors Glyph Bitmap Distribution Format, a format used to store bitmap fonts.Adobe Behandlungsdatentransfer, an xDT applicationHealthcare providers in Germany Executable bytecode file in fat binary formatBEAM (Erlang virtual machine) Bibliography databaseBibTeX binary fileEvery OS Blender project fileBlender UIQ3 Phone backup OS/2 or Win graphics format (BitMap Picture)QPeg - CorelDraw - PC Paintbrush - many WPS backup fileMicrosoft Word, Microsoft Works Bryce 7 project fileBryce 7 Bryce 7 sky presets fileBryce 7 JSON-like binary serializationMongoDB Binary space partitioning tree fileQuake-based game engines 3D geometry formatCAD systems Archivebzip2
C Ext. Description Used by C-- language sourceSphinx C--CC language source Note that on case-sensitive platforms like Unix and with the gcc compiler the uppercase .C extension indicates a C++ source file.Watcom C/C++, Borland C/C++, gcc and other C compilersCUnix file archiveCOMPACT C++ language source C++ language source COMBOOT Executable (32-bit)SYSLINUX Cabinet archiveWindows 95 and later, many file archivers COBOL language source COMBOOT Executable (incompatible with DOS COM files)SYSLINUX C++ language source ASP.NET class diagram file Common Data Format Computable Document FormatMathematica Trainz Railroad Simulator Content Dispatcher PackTrainz Railroad Simulator Vector graphics format (drawinFCorelDraw MIME type: chemical/x-cdxmlXML version of the ChemDraw Exchange format, CDX. Security certificateMicrosoft Windows IANA Image Media TypesISO/IEC 8632Computer Graphics Metafile vector graphicsA&L - HG - many Compiled Help File Microsoft Windows, Help Explorer Viewer ChordPro lead sheet (lyrics and chords) ChordPro and similar tools Decrypted Nintendo 3DS ROM cartridge Nintendo 3DS Crystallographic Information FileRasMol, Jmol Java class fileJava ooRexx class fileooRexx Command Prompt batch fileMicrosoft Windows NT based operating systems executable programsCP/M-86 operating system Chemical Markup Language, for interchange of chemical information. Celestia ModelCelestia CNR IDLMITRE 3D object file format with normals (.noff, .cnoff) NOFF is an acronym derived from Object File Format. Occasionally called CNOFF if color information is present. COBOL language sourceGnuCOBOL Coefficient fileXilinx ISE 3D object file format (.off, .coff) OFF is an acronym for Object File Format. Used for storing and exchanging 3D models. Occasionally called COFF if color information is present. DIMACS graph data format. DOS programDOS- ASP.NET precompiled stub file Configuration file Compressed imageCartesian Perceptual Compression cpio archive filecpio Control panel fileWindows 3.x COBOL source copybook file Raw image formatCanon digital cameras Raw image formatCanon R series cameras CRAM index Holds Spacecraft Assembly informationKerbal Space Program Security certificateMicrosoft Windows C# language source C# project fileMicrosoft Visual Studio Cascading style sheet Compiled Shader Object, extension of compiled HLSLHigh-Level Shading Language Comma Separated Values text file format (ASCII)CTGCanon Digital Camera Catalog Used by electronic structure programs to store orbital or density values on a three-dimensional grid. same as .cub Non-animated cursor (extended from ICO)Windows C++ language source
D Ext. Description Used byDD Programming Language source fileDMDDDirectory containing configuration files (informal standard)Unix Direct Access Archive COLLADA file Data fileDigital Anchor Extended from HTMLDarkPurpleOF's Website Extension JSON Sticker Pack FileDarkPurpleOF's Website Importable Dart source fileDart AMPL data fileAMPL LDraw (Sub)Part File, 3D ModelLDraw DataRSNetWorx Project Data file in special format or ASCII Database fileClarion (programming language) Norton Utilities disc image data. It saves Boot sector, part of FAT and root directory in image.DAT on same drive.Norton Utilities Optical disc image (can be ISO9660, but not restricted to)cdrdao, burnatonce Video CD MPEG stream 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 Dynamic sourceATS Database fileDB Browser for SQLite DarkBasic source code Database Connection configuration fileAbInitio Native format of the dBASE database management application. Debugger scriptDOS debug - Watcom debugger Symbolic debugging informationMicrosoft C/C++ deb software packageDebian Linux and derivatives digital elevation model (DEM) including GTOPO30 and USGSDEM. GTOPO30 is a distribution format for a global digital elevation model (DEM) with 30-arc-second grid spacing. USGSDEM is the standard format for the distribution of terrain elevation data for the United States. CAD DrawingBentley Systems, MicroStation and Intergraph's Interactive Graphics Design System (IGDS) CAD programs Digital Imaging and Communications in Medicine (DICOM) bitmapDICOM Software (XnView) Data Interchange FormatVisicalc Output from [diff] command - script for Patch command Directory listing (ls format)Dired DivX media format Dynamic-link library is a shared library.Microsoft Windows or OS/2 operating system. Apple Disk ImagemacOS (Disk Utility) memory dump file (e.g. screen or memory) Dimension model formatAdobe DimensionAdobe Dimension User Guide Digital Negative, a-publicly available archival format for the raw files generated by digital camerasAt least 30 camera models from at least 10 manufacturers, and at least 200 software products Redo recipes; usually written in sh, but may be written in a different language with a shebang. Redo A Document, or an ASCII text file with text formatting codes in with the text; used by many word processorsMicrosoft Word and others Microsoft Word Macro-Enabled DocumentMicrosoft Word Microsoft Word DocumentMicrosoft Word Microsoft Word document templateMicrosoft Word Office Open XML Text document templateMicrosoft Word Digital Picture Exchange Dirac format video Celestia Deep Space Catalog fileCelestia Stata database transport format.Stata Document Type Definition Data version control yaml pointer into blob storage Autodesk Design Web FormatDesign Review DrawingAutoCAD, IntelliCAD, PowerCAD, Drafix, DraftSight etc. same as JDX and JCM. Drawing Interchange File Format vector graphicsAutoCAD, IntelliCAD, PowerCAD, etc.
E Ext. Description Used byEE language source codeE EnCase Evidence File chunkEnCase Forensic Analysis Suite entity ArcInfo interchange fileGIS software 2-dimensional vector graphics fileEditor included in JFire A file format developed by ASTM International for storing point clouds and imagesMost software that enables viewing and/or editing of 3D point clouds versions of DOS system files (AUTOEXEC.BAT, COMMAND.COM, CONFIG.SYS, WINBOOT.SYS, etc.) for an emergency boot diskWindows 98, ME Source codeeC Error-checking filedvdisaster Ensoniq EPS disk imageAWAVE European data formatMedical timeseries storage files Extensible Firmware Interface EIS Spectrum Analyser ProjectEIS Spectrum Analyser Emacs Lisp source code fileEmacs Byte-compiled Emacs Lisp codeEmacs Executable and Linkable File EurekaLog File (contains details of an exception)Unix EurekaLog (https://www.eurekalog.com/) Outlook Express Email MessageWindows Live Mail, Outlook Express, Microsoft Notepad E language source code (maker)E Microsoft Enhanced Metafile Email conforming to RFC 5322; Stationery TemplateEmail clients;Outlook Express Microsoft Enhanced Metafile compressed with ZIPMicrosoft Office suite Embedded OpenType GUI wireframe/prototype projectPrikhi Pencil, Evolus Pencil Award BIOS splash screenAward BIOS, XnView Encapsulated PostScriptCorelDraw - PhotoStyler - PMView - Adobe Illustrator - Ventua Publisher Electronic Publication (e-Reader format)Okular (Linux) - Apple Books - Sony Reader - Adobe Digital Editions - Calibre (LMW) Europa Universalis 4 save game fileEuropa Universalis 4 Erlang source code file ECMAScript 6 file Data file of "esCAD pcb", PCB Pattern Layout Design SoftwareesCAD pcb provided by Electro-System Data file of "esCAD sch", Drawing Schematics Diagram SoftwareesCAD sch provided by Electro-System Windows Imaging FormatImageX, DISM, 7-Zip, wimlib Electronic Theater Controls, Inc. theatrical lighting show control fileETC Eos platform software and consoles event trace log fileMicrosoftCompare: Windows Event log fileMicrosoft Windows NT 4.0 - XP; Microsoft Event Viewer Windows Event log file XML structuredMicrosoft Windows Vista, 7, 8; Microsoft Event Viewer Elixir source code fileElixir programming language running on BEAM (Erlang virtual machine) Directly executable programDOS, OpenVMS, Microsoft Windows, Symbian or OS/2 Drawing File formatDrawing Express Melco Embroidery FormatEmbroidermodder OpenEXR raster image format (.exr). Used in digital image manipulation for theatrical film production. EXR is an acronym for Extended Dynamic Range. Stores 16 bit per pixel IEEE HALF-precision floating-point color channels. Can optionally store 32-bit IEEE floating-point "Z" channel depth-buffer components, surface normal directions, or motion vectors. Elixir script fileInteractive Elixir (IEx) shell
See also List of filename extensions List of file formats
References
External links File Extension Resource