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List - File Extensions

May 20, 202436 min read

File Extensions List

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Overview

Sources:

What is an extension?

NOTE

A filename extension, file name extension or file extension is a suffix to the name of a computer file (for example, .txt, .docx, .md). The extension indicates a characteristic of the file contents or its intended use. A filename extension is typically delimited from the rest of the filename with a period, but in some systems[1] it is separated with spaces.

Some file systems implement filename extensions as a feature of the file system itself and may limit the length and format of the extension, while others treat filename extensions as part of the filename without special distinction.

File Types

  • Binary File
  • Text file
  • Data File
  • File Signatures
  • Open File Formats
  • Proprietary File Formats
  • Metafile
  • Sparse File
  • Swap File
  • System File
  • Temporary File

Extensions by Type

Archives and Compression

  • 7z – 7-Zip compressed file
  • A – an external file extension for C/C++
  • AAC – Advanced Audio Coding
  • ABB – Android App Bundle – is the Android (and Android TV) application publishing file format (required by Google Play) taking over from:
  • ACE – ace: ACE compressed file
  • ALZ – ALZip compressed file
  • APK – For Android see ABB/APK above (APK/Android apps also usable in Windows 11); The Alpine Linux distribution also use .apk files as a package format but then with un unrelated definition as in Android. They are often called “a-packs”.
  • APPX – Microsoft Application Package (.appx)
  • APP – HarmonyOS APP Packs file format for HarmonyOS apps installable from AppGallery and third party OpenHarmony based app distribution stores.
  • AT3 – Sony’s UMD data compression
  • ARC – pre-Zip data compression
  • ARC – Nintendo U8 Archive (mostly Yaz0 compressed)
  • ARJ – ARJ compressed file
  • ASS, SSA – ASS (also SSA): a subtitles file created by Aegisub, a video typesetting application (also a Halo game engine file)
  • B – (B file) Similar to .a, but less compressed.
  • BA – BA: Scifer Archive (.ba), Scifer External Archive Type
  • BIN – compressed archive, can be read and used by CD-ROMs and Java, extractable by 7-zip and WINRAR
  • BKF – Microsoft backup created by NTBackup.c
  • BLEND – An external 3D file format used by the animation software, Blender.
  • BZ2 – bzip2
  • BMP – Bitmap Image – You can create one on Windows by right-clicking the home screen, next, click new, then, click Bitmap Image
  • CAB – A cabinet file is a library of compressed files stored as one file. Cabinet files are used to organize installation files that are copied to the user’s system.[2]
  • C4 – JEDMICS image files, a DOD system
  • CALS – JEDMICS image files, a DOD system
  • XAML – Used in programs like Visual Studio to create exe files.
  • CPT, SEA – Compact Pro (Macintosh)
  • CS – File extension for C-Sharp (C#) files
  • DAA – DAA: Closed-format, Windows-only compressed disk image
  • DEB – Debian install package
  • DMG – an Apple compressed/encrypted format
  • DDZ – a file which can only be used by the “daydreamer engine” created by “fever-dreamer”, a program similar to RAGS, it’s mainly used to make somewhat short games.
  • DN – Adobe Dimension CC file format
  • DNG – “Digital Negative” a type of raw image file format used in digital photography.
  • DPE – Package of AVE documents made with Aquafadas digital publishing tools.
  • EGG – Alzip Egg Edition compressed file
  • EGT – EGT Universal Document also used to create compressed cabinet files replaces .ecab
  • ECAB, EZIP – EGT Compressed Folder used in advanced systems to compress entire system folders, replaced by EGT Universal Document
  • ESD – ESD: Electronic Software Distribution, a compressed and encrypted WIM File
  • ESS – EGT SmartSense File, detects files compressed using the EGT compression system.
  • EXE – Windows application
  • FLIPCHART – Used in Promethean ActivInspire Flipchart Software.
  • FUN – A FUN file is a file that has been encrypted by Jigsaw ransomware, which is malware distributed by cybercriminals. It contains a file, such as a .JPG, .DOCX, .XLSX, .MP4, or .CSV file, that has been renamed and encrypted by the virus.
  • FLM – FL Studio Mobile, can also be used as a project file.
  • FLP – FL Studio Project File
  • GBS, GGP, GSC – GBS OtterUI binary scene file
  • GD – GDScript, belonging to Godot Game Engine
  • GHO, GHS – GHO Norton Ghost
  • GIF – GIF Graphics Interchange Format
  • GZ – gzip Compressed file
  • HEIC – High-Efficiency Image Codec; less storage space than the equivalent quality JPEG
  • IPG – Format in which Apple Inc. packages their iPod games. can be extracted through Winrar
  • JAR – jar ZIP file with manifest for use with Java applications.
  • JPG – Joint Photographic Experts Group – Image File
  • JPEG – Joint Photographic Experts Group – Image File
  • LAWRENCE – LBR Lawrence Compiler Type file
  • LBR – LBR Library file
  • LLSP3 – Lego Spike program file
  • LQR – LQR LBR Library file compressed by the SQ program.
  • LZH – LHA Lempel, Ziv, Huffman
  • LZ – lzip Compressed file
  • LZO – lzo
  • LZMA – lzma Lempel–Ziv–Markov chain algorithm compressed file
  • LZX – LZX
  • LUA – Lua
  • MBW – MBRWizard archive
  • MHTML – Mime HTML (Hyper-Text Markup Language) code file
  • MIDI, MID – Musical Instrument Digital Interface
  • MLOG – A file format intended to be used for Mindustry Logic
  • MPQ – MPQ Archives Used by Blizzard Entertainment
  • BIN – BIN MacBinary
  • NL2PKG – NoLimits 2 Package
  • NTH – NTH: Nokia Theme Used by Nokia Series 40 cellphones
  • OAR – OAR: OAR archive
  • OGG – Ogg Vorbis Compressed Audio File
  • OSG – Compressed osu! live gameplay archive (optimized for spectating)
  • PAK – Enhanced type of .ARC archive
  • PAR, PAR 2 – PAR Parchive
  • PART – A file used with Stud.Io
  • PAF – PAF Portable Application File
  • PEA – PEA PeaZip archive file
  • PNG – Portable Network Graphic Image File
  • WEBP – Raster image format developed by Google for web graphics
  • PHP – PHP code file
  • PYK – PYK compressed file
  • PK3 – PK3 Quake 3 archive (see note on Doom³)
  • PK4 – PK4 Doom³ archive (opens similarly to a zip archive.)
  • PNJ – a sub-format of the MNG file format, used for encapsulating JPEG files[3]
  • PXZ – a compressed layered image file used for the image editing website, pixlr.com
  • PY, PYW – Python code file
  • PMP – PenguinMod Project
  • PMS – PenguinMod Sprite
  • RAR – RAR Rar Archive, for multiple file archive (rar to .r01-.r99 to s01 and so on)
  • RAG, RAGS – Game file, a game playable in the RAGS game-engine, a free program which both allows people to create games, and play games, games created have the format “RAG game file”
  • RaX – Archive file created by RaX
  • RBXL – Roblox Studio place file (XML, binary)
  • RBXLX – Roblox Studio place file (exclusively XML)
  • RBXM – Roblox Studio model file (XML, binary)
  • RBXMX – Roblox Studio model file (exclusively XML)
  • RPM – Red Hat package/installer for Fedora, RHEL, and similar systems.
  • SB – Scratch 1.x file
  • SB2 – Scratch 2.0 file
  • SB3 – Scratch 3.0 file
  • SEN – Scifer Archive (.sen) – Scifer Internal Archive Type
  • SF2 – Polyphone Soundfont 2
  • SF3 – Polyphone Soundfont 3
  • SF4 – Polyphone Soundfont 4
  • SITX – SIT StuffIt (Macintosh)
  • SIS, SISX – SIS/SISX: Symbian Application Package
  • SKB – Google SketchUp backup File
  • SQ – SQ: Squish Compressed Archive
  • SRT – SubRip Subtitle – file format for closed captioning or subtitles.
  • SWM – Splitted WIM File, usually found on OEM Recovery Partition to store preinstalled Windows image, and to make Recovery backup (to USB Drive) easier (due to FAT32 limitations)
  • SZS – Nintendo Yaz0 Compressed Archive
  • TAR – TAR: group of files, packaged as one file
  • GZIP, TAR.GZ – (Gzip, .tar.gz): TGZ gzipped tar file
  • TB – TB Tabbery Virtual Desktop Tab file
  • TIB – TIB Acronis True Image backup
  • UHA – Ultra High Archive Compression
  • UUE – UUE unified utility engine – the generic and default format for all things UUe-related.
  • UF2 Microsoft makecode arcade game.
  • VIV – Archive format used to compress data for several video games, including Need For Speed: High Stakes.
  • VOL – video game data package.
  • VSA – Altiris Virtual Software Archive
  • WAX – Wavexpress – A ZIP alternative optimized for packages containing video, allowing multiple packaged files to be all-or-none delivered with near-instantaneous unpacking via NTFS file system manipulation.
  • WAV, WAVE – a format for storing uncompressed audio files.
  • WFP – a Wondershare Filmora project file
  • WIM – WIM A compressed disk image for installing Windows Vista or higher, Windows Fundamentals for Legacy PC, or restoring a system image made from Backup and Restore (Windows Vista/7)
  • XAP – Windows Phone Application Package
  • XZ – xz compressed files, based on LZMA/LZMA2 algorithm
  • Z – Unix compress file
  • ZOO – zoo: based on LZW
  • ZIP – zip: popular compression format
  • ZIM – ZIM: an open file format that stores wiki content for offline usage

Media Archival

  • ISO – Generic format for most optical media, including CD-ROM, DVD-ROM, Blu-ray, HD DVD and UMD.
  • NRG – Proprietary optical media archive format used by Nero applications.
  • IMG – Raw disk image, for archiving DOS formatted floppy disks, hard drives, and larger optical media.
  • ADF – for archiving Amiga floppy disks
  • ADZ – The GZip-compressed version of ADF.
  • DMS – a disk-archiving system native to the Amiga.
  • DSK – For archiving floppy disks from a number of other platforms, including the ZX Spectrum and Amstrad CPC.
  • D64 – An archive of a Commodore 64 floppy disk.
  • SDI – used for archiving and providing “virtual disk” functionality.
  • MDS – Daemon Tools native disc image format used for making images from optical CD-ROM, DVD-ROM, HD DVD or Blu-ray. It comes together with MDF file and can be mounted with DAEMON Tools.
  • MDX – Daemon Tools format that allows getting one MDX disc image file instead of two (MDF and MDS).
  • DMG – Macintosh disk image files
  • CDI – DiscJuggler image file
  • CUE – CDRWrite CUE image file
  • CIF – Easy CD Creator .cif format
  • C2D – Roxio-WinOnCD .c2d format
  • DAA – PowerISO .daa format
  • B6T – BlindWrite 6 image file
  • B5T – BlindWrite 5 image file
  • BWT – BlindWrite 4 image file
  • FFPPKG – FreeFire Profile Export Package

Other

Database

  • 4DB – 4D database Structure file

  • 4DC – 4D database Structure file (compiled in legacy mode)

  • 4DD – 4D database Data file

  • 4DIndy – 4D database Structure Index file

  • 4DIndx – 4D database Data Index file

  • 4DR – 4D database Data resource file (in old 4D versions)

  • 4DZ – 4D database Structure file (compiled in 4D Project mode)

  • ACCDB – Microsoft Database (Microsoft Office Access 2007 and later)

  • ACCDE – Compiled Microsoft Database (Microsoft Office Access 2007 and later)

  • ADT – Sybase Advantage Database Server (ADS)

  • APR – Lotus Approach data entry & reports

  • BOX – Lotus Notes Post Office mail routing database

  • CHML – Krasbit Technologies Encrypted database file for 1 click integration between contact management software and the Chameleon Software

  • DAF – Digital Anchor data file

  • DAT – DOS Basic

  • DAT – Intersystems Caché database file

  • DB – Paradox

  • DB – SQLite

  • DBF – db/dbase II,III,IV and V, Clipper, Harbour/xHarbour, Fox/FoxPro, Oracle

  • DTA – Sage Sterling database file

  • EGT – EGT Universal Document, used to compress sql databases to smaller files, may contain original EGT database style.

  • ESS – EGT SmartSense is a database of files and its compression style. Specific to EGT SmartSense

  • EAP – Enterprise Architect Project

  • FDB – Firebird Databases

  • FDB – Navision database file

  • FP, FP3, FP5, FP7 – FileMaker Pro

  • FRM – MySQL table definition

  • GDB – Borland InterBase Databases

  • GTABLE – Google Drive Fusion Table

  • KEXI – Kexi database file (SQLite-based)

  • KEXIC – shortcut to a database connection for a Kexi databases on a server

  • KEXIS – shortcut to a Kexi database

  • LDB – Temporary database file, only existing when database is open

  • LIRS – Layered Intager Storage. Stores intageres with characters such as semicolons to create lists of data.

  • MDA – Add-in file for Microsoft Access

  • MDB – Microsoft Access database

  • ADP – Microsoft Access project (used for accessing databases on a server)

  • MDE – Compiled Microsoft Database (Access)

  • MDF – Microsoft SQL Server Database

  • MYD – MySQL MyISAM table data

  • MYI – MySQL MyISAM table index

  • NCF – Lotus Notes configuration file

  • NSF – Lotus Notes database

  • NTF – Lotus Notes database design template

  • NV2 – QW Page NewViews object oriented accounting database

  • ODB – LibreOffice Base or OpenOffice Base database

  • ORA – Oracle tablespace files sometimes get this extension (also used for configuration files)

  • PCONTACT – WinIM Contact file

  • PDB – Palm OS Database

  • PDI – Portable Database Image

  • PDX – Corel Paradox database management

  • PRC – Palm OS resource database

  • SQL – bundled SQL queries

  • REC – GNU recutils database

  • REL – Sage Retrieve 4GL data file

  • RIN – Sage Retrieve 4GL index file

  • SDB – StarOffice’s StarBase

  • SDF – SQL Compact Database file

  • sqlite – SQLite

  • UDL – Universal Data Link

  • waData – Wakanda (software) database Data file

  • waIndx – Wakanda (software) database Index file

  • waModel – Wakanda (software) database Model file

  • waJournal – Wakanda (software) database Journal file

  • WDB – Microsoft Works Database

  • WMDB – Windows Media Database file – The CurrentDatabase_360.wmdb file can contain file name, file properties, music, video, photo and playlist information.

  • Avro – Data format appropriate for ingestion of record based attributes. Distinguishing characteristic is schema is stored on each row enabling schema evolution.

  • Parquet – Columnar data storage. It is typically used within the Hadoop ecosystem.

  • ORC – Similar to Parquet, but has better data compression and schema evolution handling.

Documents

Fonts

Geographic Information Systems

See Also: Geographic Information System (GIS)

Graphics - Color Palettes

  • ACT – Adobe Color Table. Contains a raw color palette and consists of 256 24-bit RGB colour values.

  • ASE – Adobe Swatch Exchange. Used by Adobe Substance, Photoshop, Illustrator, and InDesign.[10]

  • GPL – GIMP palette file. Uses a text representation of color names and RGB values. Various open source graphical editors can read this format,[11] including GIMP, Inkscape, Krita,[12] KolourPaint, Scribus, CinePaint, and MyPaint.[13]

  • PAL – Microsoft RIFF palette file

  • ICC, ICM – Color profile conforming the specification of the ICC.

Graphics - Raster

  • ART – America Online proprietary format
  • BLP – Blizzard Entertainment proprietary texture format
  • BMP – Microsoft Windows Bitmap formatted image
  • BTI – Nintendo proprietary texture format
  • CD5 – Chasys Draw IES image
  • CIT – Intergraph is a monochrome bitmap format
  • CPT – Corel PHOTO-PAINT image
  • CR2 – Canon camera raw format; photos have this on some Canon cameras if the quality RAW is selected in camera settings
  • CLIP – CLIP STUDIO PAINT format
  • CPL – Windows control panel file
  • DDS – DirectX texture file
  • DIB – Device-Independent Bitmap graphic
  • DjVu – DjVu for scanned documents
  • EGT – EGT Universal Document, used in EGT SmartSense to compress PNG files to yet a smaller file
  • Exif – Exchangeable image file format (Exif) is a specification for the image format used by digital cameras
  • GIF – CompuServe’s Graphics Interchange Format
  • GRF – Zebra Technologies proprietary format
  • ICNS – format for icons in macOS. Contains bitmap images at multiple resolutions and bitdepths with alpha channel.
  • ICO – a format used for icons in Microsoft Windows. Contains small bitmap images at multiple resolutions and bitdepths with 1-bit transparency or alpha channel.
  • .iff, .ilbm, .lbm – IFF ILBM
  • JNG – a single-frame MNG using JPEG compression and possibly an alpha channel
  • JPEG, JFIF, .jpg, .jpeg – Joint Photographic Experts Group; a lossy image format widely used to display photographic images
  • JP2 – JPEG2000
  • JPS – JPEG Stereo
  • JXL – JPEG XL, an image format designed for professional photography and web images; supports wide color gamut, high dynamic range, animations, and a max resolution of 1,073,741,823 x 1,073,741,824
  • KRA – Krita image file
  • LBM – Deluxe Paint image file
  • MAX – ScanSoft PaperPort document
  • MIFF – ImageMagick’s native file format
  • MNG – Multiple-image Network Graphics, the animated version of PNG
  • MSP – a format used by old versions of Microsoft Paint; replaced by BMP in Microsoft Windows 3.0
  • NEF – Nikon camera raw format; photos have this on some Nikon cameras if the quality RAW is selected in camera settings
  • NITF – A U.S. Government standard commonly used in Intelligence systems
  • OTB – Over The Air bitmap, a specification designed by Nokia for black and white images for mobile phones
  • PBM – Portable bitmap
  • PC1 – Low resolution, compressed Degas picture file
  • PC2 – Medium resolution, compressed Degas picture file
  • PC3 – High resolution, compressed Degas picture file
  • PCF – Pixel Coordination Format
  • PCX – a lossless format used by ZSoft’s PC Paint, popular for a time on DOS systems.
  • PDD – Adobe PhotoDeluxe image
  • PDN – Paint.NET image file
  • PGF – Progressive Graphics File
  • PGM – Portable graymap
  • PI1 – Low resolution, uncompressed Degas picture file
  • PI2 – Medium resolution, uncompressed Degas picture file; also Portrait Innovations encrypted image format
  • PI3 – High resolution, uncompressed Degas picture file
  • PICT, PCT – Apple Macintosh PICT image
  • PNG – Portable Network Graphic (lossless, recommended for display and edition of graphic images)
  • PNM – Portable anymap graphic bitmap image
  • PNS – PNG Stereo
  • PPM – Portable Pixmap (Pixel Map) image
  • .procreate – Procreate’s drawing file
  • PSB – Adobe Photoshop Big image file (for large files)
  • PSD – Adobe Photoshop Document
  • PSP – Paint Shop Pro image
  • PX – Pixel image editor image file
  • PXM – Pixelmator image file
  • PXR – Pixar Image Computer image file
  • QFX – QuickLink Fax image
  • RAW – General term for minimally processed image data (acquired by a digital camera)
  • RLE – a run-length encoding image
  • SCT – Scitex Continuous Tone image file
  • SGI, RGB, INT, BW – Silicon Graphics Image
  • TGA, .tga, .targa, .icb, .vda, .vst, .pix – Truevision TGA (Targa) image
  • TIFF, .tif, .tiff – Tag(ged) Image File Format; usually lossless, but many variants exist, including lossy ones.
  • TIFF/EP, .tif, .tiff – Tag Image File Format / Electronic Photography, ISO 12234-2; tends to be used as a basis for other formats rather than in its own right.
  • VTF – Valve Texture Format
  • WEBP – WebP, an image format designed for the web that can provide both lossless and lossy compression.
  • XBM – X Window System Bitmap
  • XCF – GIMP image (from Gimp’s origin at the eXperimental Computing Facility of the University of California)
  • XPM – X Window System Pixmap
  • ZIF – Zoomable/Zoomify Image Format (a web-friendly, TIFF-based, zoomable image format)

Graphics - Vector

  • 3DV file – 3-D wireframe graphics by Oscar Garcia
  • AMF – Additive Manufacturing File Format
  • AWG – Ability Draw
  • AI – Adobe Illustrator Document
  • CGM – Computer Graphics Metafile, an ISO Standard
  • CDR – CorelDRAW Document
  • CMX – CorelDRAW vector image
  • DP – Drawing Program file for PERQ[14]
  • DRAWIO – Diagrams.net offline diagram
  • DXF – ASCII Drawing Interchange file Format, used in AutoCAD and other CAD-programs
  • E2D – 2-dimensional vector graphics used by the editor which is included in JFire
  • EGT – EGT Universal Document, EGT Vector Draw images are used to draw vector to a website
  • EPS – Encapsulated Postscript
  • FS – FlexiPro file.x
  • GBR – Gerber file
  • ODG – OpenDocument Drawing
  • MOVIE.BYU – 3D Vector file for polygons, coordinates and more complex shapes
  • RenderMan – Displays Shading in both 2D and 3D scapes
  • SVG – Scalable Vector Graphics, employs XML
  • 3DMLW – Scene description languages (3D vector image formats)
  • STL – STL: Stereo Lithographic data format (see STL (file format)) used by various CAD systems and stereo lithographic printing machines. See above.
  • .wrl – Virtual Reality Modeling Language, VRML Uses this extension for the creation of 3D viewable web images.
  • X3D – XML based file for communicating 3D graphics
  • SXD – OpenOffice.org XML (obsolete) Drawing
  • TGAX – Texture format used by Zwift
  • V2D – voucher design used by the voucher management included in JFire
  • VDOC – Vector format used in AnyCut, CutStorm, DrawCut, DragonCut, FutureDRAW, MasterCut, SignMaster, VinylMaster software by Future Corporation
  • VSD – Vector format used by Microsoft Visio
  • VSDX – Vector format used by MS Visio and opened by VSDX Annotator
  • VND – Vision numeric Drawing file used in TypeEdit, Gravostyle.
  • WMF – WMF: Windows Meta File
  • EMF – EMF: Enhanced (Windows) MetaFile, an extension to WMF
  • ART – Xara–Drawing (superseded by XAR)
  • XAR – Xara–Drawing

Object Code, Executable Files, Shared and Dynamically Linked Library

  • 8BF – files plugins for some photo editing programs including Adobe Photoshop, Paint Shop Pro, GIMP and Helicon Filter.
  • .a – a static library on Unix-like systems
  • .a – Objective C native static library
  • a.out – (no suffix for executable image, .o for object files, .so for shared object files) classic Unix object format, now often superseded by ELF
  • APK – Android Package
  • APP – A folder found on macOS systems containing program code and resources, appearing as one file.
  • .app, APP – file extension are executable application packages for running apps on HarmonyOS, OpenHarmony and HarmonyOS NEXT devices.
  • BAC – an executable image for the RSTS/E system, created using the BASIC-PLUS COMPILE command[15]
  • BPL – a Win32 PE file created with Delphi or C++Builder containing a package.
  • Bundle – a Macintosh plugin created with Xcode or make which holds executable code, data files, and folders for that code.
  • .class – Compiled Java bytecode
  • COFF – (no suffix for executable image, .o for object files) Unix Common Object File Format, now often superseded by ELF
  • COM – Simple executable format used by CP/M and DOS.
  • DCU – Delphi compiled unit
  • DLL – Dynamic library used in Windows and OS/2 to store data, resources and code.
  • DOL – the format used by the GameCube and Wii, short for Dolphin, which was the codename of the GameCube.
  • .EAR – archives of Java enterprise applications
  • ELF – (no suffix for executable image, .o for object files, .so for shared object files) used in many modern Unix and Unix-like systems, including Solaris, other System V Release 4 derivatives, Linux, and BSD)
  • .exe – DOS executable (.exe: used in DOS)
  • .EXE – New Executable (used in multitasking (“European”) MS-DOS 4.0, 16-bit Microsoft Windows, and OS/2)
  • .EXE – Portable Executable used in Microsoft Windows and some other systems
  • .ipa, .IPA – file extension for apple IOS application executable file. Another form of zip file.
  • .JAR – archives of Java class files
  • JEFF – a file format allowing execution directly from static memory[16]
  • .ko – Loadable kernel module
  • LIB – a static library on Microsoft platforms
  • LIST – variable list
  • Mach-O – (no suffix for executable image, .o for object files, .dylib and .bundle for shared object files) Mach-based systems, notably native format of macOS, iOS, watchOS, and tvOS
  • .NLM – NetWare Loadable Module the native 32-bit binaries compiled for Novell’s NetWare Operating System (versions 3 and newer)
  • .o – un-linked object files directly from the compiler
  • OBJ – object file on Windows
  • RLL – used in Microsoft operating systems together with a DLL file to store program resources
  • .s1es – Executable used for S1ES learning system.
  • .so – shared library, typically ELF
  • .VAP – Value Added Process the native 16-bit binaries compiled for Novell’s NetWare Operating System (version 2, NetWare 286, Advanced NetWare, etc.)
  • WAR, .WAR – .WAR are archives of Java Web applications
  • .XAP – Windows Phone package
  • XBE – XBE is Xbox executable
  • XCOFF – (no suffix for executable image, .o for object files, .a for shared object files) extended COFF, used in AIX
  • XEX – XEX is Xbox 360 executable
  • .XPI – PKZIP archive that can be run by Mozilla web browsers to install software.

Object extensions:

  • .OCX – .OCX are Object Control extensions
  • .TLB – .TLB are Windows Type Library
  • .VBX – .VBX are Visual Basic extensions

Presentation

References

Programming

Security

Certificates and Keys

X.509[edit]

Encryption

  • AXX – Encrypted file, created with AxCrypt
  • EEA – An encrypted CAB, ostensibly for protecting email attachments
  • TC – Virtual encrypted disk container, created by TrueCrypt
  • KODE – Encrypted file, created with KodeFile
  • nSignE – An encrypted private key, created by nSign[24]

Passwords

  • BPW – Encrypted password file created by Bitser password manager
  • KDB – KeePass 1 database
  • KDBX – KeePass 2 database

Sound and Music

Uncompressed

  • 8SVX – Commodore-Amiga 8-bit sound (usually in an IFF container)
  • 16SVX – Commodore-Amiga 16-bit sound (usually in an IFF container)
  • AIFF, AIF, AIFC – Audio Interchange File Format
  • AU – Simple audio file format introduced by Sun Microsystems
  • AUP3 – Audacity’s file for when you save a song
  • BWF – Broadcast Wave Format, an extension of WAVE
  • CDDA – Compact Disc Digital Audio
  • DSF, DFF – Direct Stream Digital audio file, also used in Super Audio CD
  • RAW – Raw samples without any header or sync
  • WAV – Microsoft Wave
  • CWAV – file read by the Nintendo 3DS for Home-screen sound effects

Compressed

Lossy Audio

Source Code

  • ADA, ADB, 2.ADA – Ada (body) source
  • ADS, 1.ADA – Ada (specification) source
  • ASM, S – Assembly language source
  • BAS – BASIC, FreeBASIC, Visual Basic, BASIC-PLUS source,[15] PICAXE basic
  • BB – Blitz Basic Blitz3D
  • BMX – Blitz Basic BlitzMax
  • C – C source
  • CLJ – Clojure source code
  • CLS – Visual Basic class
  • COB, CBL – COBOL source
  • CPP, CC, CXX, C, CBP – C++ source
  • CS – C# source
  • CSPROJ – C# project (Visual Studio .NET)
  • D – D source
  • DBA – DarkBASIC source
  • DBPro123 – DarkBASIC Professional project
  • E – Eiffel source
  • EFS – EGT Forever Source File
  • EGT – EGT Asterisk Source File, could be J, C#, VB.net, EF 2.0 (EGT Forever)
  • EL – Emacs Lisp source
  • FOR, FTN, F, F77, F90 – Fortran source
  • FRM – Visual Basic form
  • FRX – Visual Basic form stash file (binary form file)
  • FTH – Forth source
  • GED – Game Maker Extension Editable file as of version 7.0
  • GM6 – Game Maker Editable file as of version 6.x
  • GMD – Game Maker Editable file up to version 5.x
  • GMK – Game Maker Editable file as of version 7.0
  • GML – Game Maker Language script file
  • GO – Go source
  • H – C/C++ header file
  • HPP, HXX – C++ header file
  • HS – Haskell source
  • HX – Haxe source
  • I – SWIG interface file
  • INC – Turbo Pascal included source
  • JAVA – Java source
  • JS – Javascript source
  • L – lex source
  • LGT – Logtalk source
  • LISP – Common Lisp source
  • M – Objective-C source
  • M – MATLAB
  • M – Mathematica
  • MAP – CodeWarrior linker file
  • M4 – m4 source
  • ML – Standard ML and OCaml source
  • MSQR – M² source file, created by Mattia Marziali
  • N – Nemerle source
  • NB – Nuclear Basic source
  • P – Parser source
  • PAS, PP, P – Pascal source (DPR for projects)
  • PHP, PHP3, PHP4, PHP5, PHPS, Phtml – PHP source
  • PIV – Pivot stickfigure animator
  • PL, PM – Perl
  • PLI, PL1 – PL/I
  • PRG – Ashton-Tate; dbII, dbIII and dbIV, db, db7, clipper, Microsoft Fox and FoxPro, harbour, xharbour, and Xbase
  • PRO – IDL
  • POL – Apcera Policy Language doclet
  • PY – Python source
  • R – R source
  • raku, rakumod, rakudoc, rakutest, nqp – Raku Language
  • RED – Red source
  • REDS – Red/System source
  • RB – Ruby source
  • RESX – Resource file for .NET applications
  • RC, RC2 – Resource script files to generate resources for .NET applications
  • RKT, RKTL – Racket source
  • RS – Rust source
  • Resources – Visual Studio Code
  • S – CodeWarrior / PowerPC ASM
  • SCALA – Scala source
  • SCI, SCE – Scilab
  • SCM – Scheme source
  • SD7 – Seed7 source
  • SKB, SKC – Sage Retrieve 4GL Common Area (Main and Amended backup)
  • SKD – Sage Retrieve 4GL Database
  • SKF, SKG – Sage Retrieve 4GL File Layouts (Main and Amended backup)
  • SKI – Sage Retrieve 4GL Instructions
  • SKK – Sage Retrieve 4GL Report Generator
  • SKM – Sage Retrieve 4GL Menu
  • SKO – Sage Retrieve 4GL Program
  • SKP, SKQ – Sage Retrieve 4GL Print Layouts (Main and Amended backup)
  • SKS, SKT – Sage Retrieve 4GL Screen Layouts (Main and Amended backup)
  • SKZ – Sage Retrieve 4GL Security File
  • SLN – Visual Studio solution
  • SPIN – Spin source (for Parallax Propeller microcontrollers)
  • STK – Stickfigure file for Pivot stickfigure animator
  • SWG – SWIG source code
  • TCL – Tcl source code
  • VAP – Visual Studio Analyzer project
  • VB – Visual Basic.NET source
  • VBG – Visual Studio compatible project group
  • VBP, VIP – Visual Basic project
  • VBPROJ – Visual Basic .NET project
  • VCPROJ – Visual C++ project
  • VDPROJ – Visual Studio deployment project
  • X – Kamek linker file
  • XPL – XProc script/pipeline
  • XQ – XQuery file
  • XSL – XSLT stylesheet
  • Y – yacc source

Spreadsheets

Tabular Data

Video

  • AAF – mostly intended to hold edit decisions and rendering information, but can also contain compressed media essence
  • 3GP – the most common video format for cell phones
  • GIF – Animated GIF (simple animation; until recently often avoided because of patent problems)
  • ASF – container (enables any form of compression to be used; MPEG-4 is common; video in ASF-containers is also called Windows Media Video (WMV))
  • AVCHD – Advanced Video Codec High Definition
  • AVI – container (a shell, which enables any form of compression to be used)
  • .bik – BIK Bink Video file. A video compression system developed by RAD Game Tools
  • BRAW – a video format used by Blackmagic’s Ursa Mini Pro 12K cameras.
  • CAM – aMSN webcam log file
  • COLLAB – Blackboard Collaborate session recording
  • DAT – video standard data file (automatically created when we attempted to burn as video file on the CD)
  • DVR-MS – Windows XP Media Center Edition’s Windows Media Center recorded television format
  • FLV – Flash video (encoded to run in a flash animation)
  • MPEG-1 – M1V Video
  • MPEG-2 – M2V Video
  • NOA – rare movie format use in some Japanese eroges around 2002
  • FLA – Adobe Flash (for producing)
  • FLR – (text file which contains scripts extracted from SWF by a free ActionScript decompiler named FLARE)
  • SOL – Adobe Flash shared object (“Flash cookie”)
  • STR – Sony PlayStation video stream
  • M4V – video container file format developed by Apple
  • .mkv – Matroska Matroska is a container format, which enables any video format such as MPEG-4 ASP or AVC to be used along with other content such as subtitles and detailed meta information
  • WRAP – MediaForge (*.wrap)
  • MNG – mainly simple animation containing PNG and JPEG objects, often somewhat more complex than animated GIF
  • .mov – QuickTime container which enables any form of compression to be used; Sorenson codec is the most common; QTCH is the filetype for cached video and audio streams
  • .mpeg, .mpg, .mpe – MPEG
  • THP – Nintendo proprietary movie/video format
  • MPEG-4 – MPEG-4 Part 14, shortened “MP4” multimedia container (most often used for Sony’s PlayStation Portable and Apple’s iPod)
  • MXF – Material Exchange Format (standardized wrapper format for audio/visual material developed by SMPTE)
  • ROQ – used by Quake III Arena
  • NSV – NSV Nullsoft Streaming Video (media container designed for streaming video content over the Internet)
  • Ogg – container, multimedia
  • RM – RealMedia
  • SVI – SVI Samsung video format for portable players
  • SMI – SMI SAMI Caption file (HTML like subtitle for movie files)
  • .smk – SMK Smacker video file. A video compression system developed by RAD Game Tools
  • SWF – Adobe Flash (for viewing)
  • .TORRENT – A file that does not hold the video, but simply where the video is located (Can also be used to store the location of a software or audio)
  • WMV – Windows Media Video (See ASF)
  • WTV – Windows Vista’s and up Windows Media Center recorded television format
  • YUV – raw video format; resolution (horizontal x vertical) and sample structure 4:2:2 or 4:2:0 must be known explicitly
  • WebM – video file format for web video using HTML5

Web

Static

  • DTD – Document Type Definition (standard), MUST be public and free
  • .html, .htm – HTML HyperText Markup Language
  • .xhtml, .xht – XHTML eXtensible HyperText Markup Language
  • .mht, .mhtml – MHTML Archived HTML, store all data on one web page (text, images, etc.) in one big file
  • .maff – MAF web archive based on ZIP

Dynamically generated

  • .asp – ASP Microsoft Active Server Page
  • .aspx – ASPX Microsoft Active Server Page. NET
  • .adp – ADP AOLserver Dynamic Page
  • .bml – BML Better Markup Language (templating)
  • .cfm – CFM ColdFusion
  • .cgi – CGI
  • .ihtml – iHTML Inline HTML
  • .jsp – JSP JavaServer Pages
  • .las, .lasso, .lassoapp – Lasso, A file created or served with the Lasso Programming Language
  • .pl – Perl
  • .php, .php?, .phtml – PHP ? is version number (previously abbreviated Personal Home Page, later changed to PHP: Hypertext Preprocessor)
  • .shtml – SSI HTML with Server Side Includes (Apache)
  • .stm – SSI HTML with Server Side Includes (Apache)

Markup languages and other web standards-based formats[edit]

  • .atom, .xml – Atom Another syndication format.
  • .eml – EML Format used by several desktop email clients.
  • .jsonld – JSON-LD A JSON-based serialization for linked data.
  • .kprx – KPRX A XML-based serialization for workflow definition generated by K2.
  • .ps – PS A XML-based serialization for test automation scripts called PowerScripts for K2 based applications.
  • .metalink, .met – Metalink A format to list metadata about downloads, such as mirrors, checksums, and other information.
  • .rss, .xml – RSS Syndication format.
  • .markdown, .md – Markdown Plain text formatting syntax, which is popularly used to format “readme” files.
  • .se – Shuttle Another lightweight markup language.

Other[edit]

  • AXD – cookie extensions found in temporary internet folder
  • APK – Android Package Kit
  • BDF – Binary Data Format – raw data from recovered blocks of unallocated space on a hard drive
  • CBP – CD Box Labeler Pro, CentraBuilder, Code::Blocks Project File, Conlab Project
  • CEX – SolidWorks Enterprise PDM Vault File
  • COL – Nintendo GameCube proprietary collision file (.col)
  • CREDX – CredX Dat File
  • DDB – Generating code for Vocaloid singers voice (see .DDI)
  • DDI – Vocaloid phoneme library (Japanese, English, Korean, Spanish, Chinese, Catalan)
  • DUPX – DuupeCheck database management tool project file
  • FTM – Family Tree Maker data file
  • FTMB – Family Tree Maker backup file
  • GA3 – Graphical Analysis 3
  • .ged – GEDCOM (GEnealogical Data COMmunication) format to exchange genealogy data between different genealogy software
  • HLP – Windows or CP/M help file
  • IGC – flight tracks downloaded from GPS devices in the FAI’s prescribed format
  • INF – similar format to INI file; used to install device drivers under Windows, inter alia.
  • JAM – JAM Message Base Format for BBSes
  • KMC – tests made with KatzReview’s MegaCrammer
  • KCL – Nintendo GameCube/Wii proprietary collision file (.kcl)
  • KTR – Hitachi Vantara Pentaho Data Integration/Kettle Transformation Project file
  • LNK – Microsoft Windows format for Hyperlinks to Executables
  • LSM – LSMaker script file (program using layered .jpg to create special effects; specifically designed to render lightsabers from the Star Wars universe) (.lsm)
  • MCR – a macro recording file for Super Macro software (.mcr)
  • MELSAVE – Melon Playground build save file
  • MELMOD – Melon Playground mod file
  • NARC – archive format used in Nintendo DS games
  • OER – AU OER Tool, Open Educational Resource editor
  • PA – Used to assign sound effects to materials in KCL files (.pa)
  • PIF – Used to run MS-DOS programs under Windows
  • POR – So called “portable” SPSS files, readable by PSPP
  • PXZ – Compressed file to exchange media elements with PSALMO
  • RISE – File containing RISE generated information model evolution
  • SCR – Windows Screen Saver file
  • TOPC – TopicCrunch SEO Project file holding keywords, domain, and search engine settings (ASCII)
  • XLF – Utah State University Extensible LADAR Format
  • XMC – Assisted contact lists format, based on XML and used in kindergartens and schools
  • ZED – My Heritage Family Tree
  • zone – Zone file a text file containing a DNS zone
  • FX – Microsoft DirectX plain text effects and properties for the associated file and are used to specify the textures, shading, rendering, lighting and other 3D effects (.fx)
  • MIFRAMES – Mine-imator keyframes file (.miframes)
  • MILANGUAGE – Mine-Imator language data file (.milanguage)
  • MIDATA – Mine-Imator data file (.midata)
  • BCA – Short for Burst Cutting Area Holds the information of the circular area near the center of a DVD, HD DVD or Blu-ray Disc, it is usually 64 bytes in size. (.bca)

Cursors[edit]

  • ANI – Animated cursor
  • CUR – Cursor file
  • Smes – Hawk’s Dock configuration file

Generalized files[edit]

General data formats[edit]

These file formats are fairly well defined by long-term use or a general standard, but the content of each file is often highly specific to particular software or has been extended by further standards for specific uses.

Text-based[edit]

Generic file extensions[edit]

These are filename extensions and broad types reused frequently with differing formats or no specific format by different programs.

Binary files[edit]

  • .bak, .bk – Bak file various backup formats: some just copies of data files, some in application-specific data backup formats, some formats for general file backup programs
  • BIN – binary data, often memory dumps of executable code or data to be re-used by the same software that originated it
  • DAT – data file, usually binary data proprietary to the program that created it, or an MPEG-1 stream of Video CD
  • DSK – file representations of various disk storage images
  • RAW – raw (unprocessed) data
  • SZH – files that are associated with zero unique file types (the most prevalent being the Binary Data format)

Text files[edit]

  • .cnf, .conf, .cfg – configuration file substantially software-specific
  • .log – logfiles usually text, but sometimes binary
  • .asc, .text, .txt – human-readable plain text, usually no more specific

Partial files[edit]

Differences and patches[edit]

  • diff – text file differences created by the program diff and applied as updates by patch

Incomplete transfers[edit]

Temporary files[edit]

  • .temp, .tmp – Temporary file sometimes in a specific format, but often just raw data in the middle of processing
  • Pseudo-pipelines, Pseudo-pipeline – Pseudo-pipeline file used to simulate a software pipe

Appendix

Note created on 2024-05-15 and last modified on 2024-05-15.

LIST FROM [[List - File Extensions]] AND -"CHANGELOG" AND -"04-RESOURCES/Lists/List - File Extensions"

(c) No Clocks, LLC | 2024

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