This alphabetical list of filename extensions contains extensions of notable file formats used by multiple notable applications or services.
M Ext. Description Used by Mathematica Package FileMathematica MATLAB M-FileMATLAB Mercury Source FileMercury Source codeObjective-C BDAV MPEG-2 transport stream MPEG Audio Layer 3 Uniform Resource Locator playlistMedia players MPEG Audio Layer 3 Uniform Resource Locator playlist, using UTF-8 encodingMedia players MPEG-4 Part 14 audioiTunes Store DRM-encumbered MPEG-4 Part 14 mediaiTunes Store (formerly) See M4AApple iPhone ringtones MPEG-4 Part 14 video, which may optionally be encumbered by FairPlay DRMiTunes Store, HandBrake Mupen64 gameplay recordingMupen64 Autodesk Maya scene description format. The native format of the Maya modeling, animation, and rendering software. MATLAB MAT-files. The native data format of the MATLAB numerical computation software. Stores numerical matrices, Boolean values, or strings. Also stores sparse arrays, nested structures, and more.MATLAB and Octave Unix mailbox format. Holds a collection of email messages. Native archive format of email clients such as Unix mail, Thunderbird, and many others. A zip file that contains .mcpack or .mcworld files to modify Minecraft: Bedrock Edition generally used to distribute add-ons to other users.Minecraft: Bedrock Edition A Minecraft custom resource pack configuration file.Minecraft: Bedrock Edition A Minecraft datapack function file for executing in-game scripts with the built-in command system.Minecraft: Java Edition A zipped resource or behavior pack that modifies Minecraft: Bedrock Edition, typically used to transfer resources between users.Minecraft: Bedrock Edition Minecraft Bedrock Editor's filetype. Files of this type only open in Editor and are capable of containing Editor extensions.Minecraft: Bedrock Edition Contains a Minecraft structure such as a building or natural feature, saved using the Structure Block tool can be shared between players, allowing the sharing of each other's structures.Minecraft: Bedrock Edition A zip archive containing the template of a world used in Minecraft.Minecraft: Bedrock Edition A zip archive that contains all the files needed to load a Minecraft: Bedrock Edition or Minecraft Education world, for example .dat and .txt files.Minecraft: Bedrock Edition Multimedia Container Format (predecessor of Matroska) Markdown-formatted text fileMarkdown MDB database file. The native format of the Microsoft Access database application. Used in conjunction with the Access relational database management system and as an exchange format.Microsoft Access Master Data File, a Microsoft SQL Server file typeMicrosoft SQL Server Measurement Data Format, a binary file format for vector measurement dataautomotive industry, developed by Robert Bosch GmbH Document save in high-resolution, created by MSOffice to scan documents (OCR) and turn them into a .DOCMicrosoft Office Digital Geometry (Programmable CAD) file format, developed by DInsightDigital Geometric Kernel Model3D Design Plus or Simulink Microsoft minidump file created by Windows when a program crashes Microsoft Windows SDK Midi SessionSound Imp. MEX file (executable command)Matlab Wolfram System MGF bitmap format. Used by the Wolfram System user interface for storing raster images. MGF is an acronym for Mathematica Graphics Format. Materials and Geometry Format MIME encapsulation of aggregate HTML documentsWeb browsers Standard MIDI fileMusic synthetizers, Winamp Matroska audio Matroska video MATLAB live script file MATLAB Source codeObjective-C++ Mindustry logic processor fileMindustry MathML mathematical markup language. Used for integrating mathematical formulas in web documents. Rendering of embedded MathML is supported by a number of browsers and browser additions. Surface metrology or image analysis documentMountainsMap Modelica models. File format specified by the Modelica Association. eBookMobipocket, Kindle AMPL model fileAMPL Modula language source Modula-2 source code fileClarion Modula-2 Tracker file format created for Ultimate Soundtracker for the AmigaMOD (file format) MOD is recording format for use in digital tapeless camcorders.MOD and TOD ModuleGTK+ same as Modelica Model .mo. MDL MolfileRasMol Tripos Sybyl MOL2 FormatSYBYL, RasMol MOPAC input fileMOPAC, RasMol Animation format (Mac)QuickTime, AutoCAD AutoFlix MPEG audio fileWinamp, xing MPEG audio stream, layer 3AWAVE, CoolEdit(+PlugIn), Winamp, many others multimedia container format, MPEG 4 Part 14Winamp MPEG audio stream, layer 1,2,3AWAVE Musepack audio LDraw file (multi-part DAT file)LDraw multimedia containter format, video, audioMPEG Player, Winamp see MPEG MPS linear programming system format (.mps) Commonly used as input format by LP solvers. MPS is an acronym for Mathematical Programming System. A Engine Simulator engine save fileEngine Simulator MarsShell Script FileMarsShell (mrsh) management saved console Microsoft; Microsoft MMC File type used by Musescore when saving a score Mindustry map fileMindustry Mindustry schematic fileMindustry Manchester Scene Description Language Multiple sequence file (Pileup format) Windows Installer PackageMicrosoft Windows Microsoft Outlook metadata for a Microsoft Word 2000 email attachment Microsoft Outlook Windows visual style fileMicrosoft Windows Microsoft Update PackageMicrosoft Windows See M2TS MUP -- File type used by MindMup to export editable Mind Maps File type used by FreeMind to export editable Mind Maps Wolfram Language serialized package format (.mx) Wolfram Language serialized package format. Used for the distribution of Wolfram Language packages. Stores arbitrary Wolfram Language expressions in a serialized format optimized for fast loading. Material exchange format (RFC 4539, SMPTE 377M) a MyISAM data file in MySQLMyISAM, MySQL a MyISAM index file in MySQLMyISAM, MySQL
N Ext. Description Used by Wolfram Mathematica Notebook (see Wolfram Language)Mathematica Binary DatanetCDF software package Instructions for NC (Numerical Control) machineCAMS Name code programnamec-git/namec software package NC Drill File (Excellon Format, printed circuit board hole definitions)Most PCB layout software Nikon Picture Control file Nikon cameras Nikon file created by Image Dust Off ref photo Nikon cameras NDK seismologic file format. Commonly used for storage and exchange of earthquake data. Stores geographical information and wave measurements for individual seismological events. Nintendo DS file. Used for Homebrew and official games.Nintendo DS consoles and emulators Nikon Electronic Format, Nikon's RAW image formatNikon cameras Text file; media Pajek graph data format (.net) Pajek graph language and data format. Commonly used exchange format for graphs. The native format of the Pajek network analysis software. The format name is Slovenian for spider.Pajek network analysis software Pro/Engineer neutral file formatPTC Pro/Engineer Nikon raw video file Nikon cameras NEXUS phylogenetic format (.nex, .nxs) Commonly used for storage and exchange of phylogenetic data. Can store DNA and protein sequences, taxa distances, alignment scores, and phylogenetic trees. Instructions for NC machine made by TRUMPFTRUMPFNFOiNFO for accompanying media filesKodi, Plex Nim source code fileNim NMFNode Map FileUsed by SpicyNodes Nikon IPTC camera import file Nikon cameras 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. Nikon Picture Control file Nikon cameras Nikon Picture Control file for the Z9 generation cameras Nikon cameras Nuendo Project FileSteinberg Nuendo Nintendo Switch executable file Nikon Coolpix RAW imageNikon NetRexx Script FileNetRexx NetStumbler fileNetStumbler mediaNullsoft Streaming Audio NES sound format fileTransfer of NES music data Nintendo Switch eShop formatNintendo Switch, Ryujinx mediaNullsoft Streaming Video Numbers spreadsheet fileNumbers NWD, NWFNavisworks 3D drawingNavisworks Same as NEXUS (.nex, .nxs). See NEX above for more details. NEXUS phylogenetic format (.nex, .nxs)
O Ext. Description Used by Object fileUNIX - Atari - GCC OpenStreetmap packed changesetOpenStreetMap OpenStreetmap packed dataOpenStreetMap Compiled machine language code Object codeIntel Relocatable Object Module Wavefront Object ScriptObjectScript OLE custom control Database front end documentOpenDocument, LibreOffice Formula, mathematical equationsOpenDocument, LibreOffice Drawings and vector graphicsOpenDocument, LibreOffice, Collabora Online PresentationsOpenDocument, LibreOffice, Collabora Online OpenDocument spreadsheet format (.ods)OpenDocument, LibreOffice, Collabora Online Text (Word processing) documentsOpenDocument, LibreOffice, Collabora Online 3D object file format (.off, .coff) OFF is an acronym for Object File Format. Used for storing and exchanging 3D models. Audio file in the Ogg container formatlibogg Vorbis audio in the Ogg container formatlibogg Video file in the Ogg container formatlibogg Ogg Multiplex Profilelibogg OpenStreetMap packed dataOpenStreetMap OpenStreetMap line-separated dataOpenStreetMap Ogg/Opus audio filempv, mplayer, many others (official file format). Emacs Org modeEmacs Org mode major mode Older Origin ProjectOrigin versions 4 or earlier Osu! StoryboardOsu! Osu! SkinOsu! OpenStreetMap XML dataOpenStreetMap OpenStreetMap XML changesetOpenStreetMap Osu! ReplayOsu! Offline Storage TableMicrosoft e-mail software: Outlook Express, Microsoft Outlook Osu! Beatmap InfoOsu! Osu! BeatmapOsu! Over-the-air bitmap graphics OpenType font The Vim OutlinerA vim plugin Formula, mathematical equations templateOpenDocument, LibreOffice, Collabora Online Drawings and vector graphics templateOpenDocument, LibreOffice, Collabora Online Presentations templateOpenDocument, LibreOffice, Collabora Online Spreadsheets templateOpenDocument, LibreOffice, Collabora Online Text (Word processing) documents templateOpenDocument, LibreOffice, Collabora Online Overlay file (part of program to be loaded when needed)TomTom Point of Interest Web ontology language (OWL) fileProtégé and other ontology editors OpenOffice.org extensionOpenOffice.org / LibreOffice
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