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| Udvidelse | Filtypeudvikler | Filkategori | Beskrivelse Af Filtype | Software | Softwareudvikler |
|---|---|---|---|---|---|
| .M | MathWorks | Udviklerfiler | MATLAB Source Code File | Apple TextEdit | Apple |
| .M15 | Moving Picture Experts Group | Videofiler | MPEG Video File | Apple iTunes | Apple |
| .M1A | Open Source | Lydfiler | MPEG-1 Audio File | Apple QuickTime Player | Apple |
| .M1V | Roxio | Videofiler | MPEG-1 Video File | Apple QuickTime Player | Apple |
| .M21 | AXMEDIS Products and Services | Videofiler | AXMEDIS MPEG-21 File | Apple QuickTime Player | Apple |
| .M2A | Unknown Developer | Videofiler | MPEG-1 Layer 2 Audio File | Apple QuickTime Player | Apple |
| .M2S | Maxthon | Indstillingsfiler | Maxthon 2 Browser Skin File | Apple QuickTime Player | Apple |
| .M2V | Webteh | Videofiler | MPEG-2 Packetized Elementary Stream | Apple QuickTime Player | Apple |
| .M3U | Nullsoft | Lydfiler | Media Playlist File | Apple iTunes | Apple |
| .M3U8 | Various Developers | Lydfiler | UTF-8 M3U Playlist File | Apple iTunes | Apple |
| .M4A | Apple | Lydfiler | MPEG-4 Audio File | Apple iTunes | Apple |
| .M4B | Apple | Lydfiler | MPEG-4 Audio Book File | Apple iTunes | Apple |
| .M4P | Apple | Lydfiler | iTunes Music Store Audio File | Apple iTunes | Apple |
| .M4R | Apple | Lydfiler | iPhone Ringtone File | Apple iTunes | Apple |
| .M4U | Open Source | Videofiler | MPEG-4 Playlist | Apple QuickTime Player | Apple |
| .M4V | Apple | Videofiler | iTunes Video File | Apple iTunes | Apple |
| .M75 | Moving Picture Experts Group | Videofiler | MPEG Video File | Apple iTunes | Apple |
| .MAC | Apple | Rasterbilledfiler | MacPaint Image | Apple QuickTime Player | Apple |
| .MAC2 | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MACRO | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MACWRITE | Apple | Tekstfiler | MacWrite Text Document | MacWrite | Apple |
| .MAILBOX | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MAK | Sublime HQ Pty Ltd | Udviklerfiler | Makefile | Apple Xcode | Apple |
| .MAKEFILE | Sublime HQ Pty Ltd | Udviklerfiler | Makefile | Apple Xcode | Apple |
| .MAN | Unknown Developer | Tekstfiler | Unix Manual | Apple TextEdit | Apple |
| .MANIFEST | Microsoft Corporation | Systemfiler | Windows Application Manifest File | Apple TextEdit | Apple |
| .MAPS | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MARCH | Unknown Developer | Datafiler | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .MARIO | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MARKDOWN | Various Developers | Udviklerfiler | Markdown Documentation File | Apple TextEdit | Apple |
| .MBDB | Apple | Datafiler | iTunes Backup Manifest Database | Apple iTunes | Apple |
| .MBL | Vernier Software & Technology | Datafiler | Logger Pro Data File | Vernier Graphical Analysis | Apple |
| .MBOX | Unknown Developer | Datafiler | E-mail Mailbox | Apple Mail | Apple |
| .MCWORLD | Smith Micro Software | Spilfiler | Minecraft World Backup File | Apple Archive Utility | Apple |
| .MD | Various Developers | Udviklerfiler | Markdown Documentation File | Apple TextEdit | Apple |
| .MDBACKUP | Apple | Sikkerhedskopifiler | iPhone Data Backup File | Apple iTunes | Apple |
| .MDOWN | John Gruber | Tekstfiler | Markdown Markup Language Source Code | Apple TextEdit | Apple |
| .ME | Unknown Developer | Ikke Almindelige Filer | Temporary Delete Me File | Apple Pages | Apple |
| .MEMORY | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MENU | id Software | Spilfiler | Quake 3 Engine Menu File | Apple TextEdit | Apple |
| .MERLIN | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MESSAGES | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .METADATA_NEVER_INDEX | Apple | Systemfiler | Spotlight Never Index File | macOS | Apple |
| .METAL | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MF | Walt Disney Imagineering | Spilfiler | Gameplay Multifile | Apple TextEdit | Apple |
| .MICE | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MID | Open Source | Lydfiler | MIDI Audio File | Apple QuickTime Player | Apple |
| .MIDI | Synthesia LLC | Lydfiler | MIDI File | Apple QuickTime Player | Apple |
| .MIM | Internet Engineering Task Force | Kodet filer | Multi-Purpose Internet Mail Message File | Apple Mail | Apple |
| .MIME | Various Developers | Kodet filer | Multi-Purpose Internet Mail Extension | Apple Mail | Apple |
| .MISC | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MJP | LG Electronics | Videofiler | MJPEG Video File | Apple QuickTime Player | Apple |
| .MKEXT | Apple | Systemfiler | Mac OS X Mach Kernel Extension Memory Cache | macOS | Apple |
| .MKV | Various Developers | Videofiler | Matroska Video File | olimsoft OPlayer | Apple |
| .MLTV | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MM | Kodak | Datafiler | Kodak EasyShare Thumbnail Cache File | Apple Xcode | Apple |
| .MNU | Autodesk, Inc. | Indstillingsfiler | AutoCAD Interface Layout File | Apple TextEdit | Apple |
| .MODEM | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MOM | Apple | Udviklerfiler | Managed Object Model | Apple Xcode | Apple |
| .MOO | Apple | Videofiler | Apple QuickTime Movie Clip File | Apple QuickTime Player | Apple |
| .MOOV | Apple | Videofiler | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOUSE | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MOV | Apple | Videofiler | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOVEMON | Unknown Developer | Datafiler | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .MOVIE | Apple | Videofiler | QuickTime Movie File | Apple QuickTime Player | Apple |
| .MP1 | RealNetworks | Lydfiler | MPEG-1 Layer 1 Audio File | Apple iTunes | Apple |
| .MP2 | New World Computing | Spilfiler | Heroes Of Might And Magic II Map File | Apple iTunes | Apple |
| .MP21 | AXMEDIS Products and Services | Videofiler | AXMEDIS MPEG-21 Object | Apple QuickTime Player | Apple |
| .MP2V | Roxio | Videofiler | MPEG-2 Video File | Apple QuickTime Player | Apple |
| .MP3 | Moving Picture Experts Group | Lydfiler | MP3 Audio File | Apple iTunes | Apple |
| .MP4 | Moving Picture Experts Group | Videofiler | MPEG-4 Video File | Apple iTunes | Apple |
| .MP4V | Moving Picture Experts Group | Videofiler | MPEG-4 Video File | Apple iTunes | Apple |
| .MPA | Unknown Developer | Lydfiler | MPEG-2 Audio File | Apple iTunes | Apple |
| .MPE | Unknown Developer | Videofiler | MPEG Movie | Apple iTunes | Apple |
| .MPEG | Unknown Developer | Videofiler | MPEG Movie | Apple iTunes | Apple |
| .MPG | Moving Picture Experts Group | Videofiler | MPEG Video File | Apple iTunes | Apple |
| .MPG4 | Moving Picture Experts Group | Videofiler | MPEG-4 Video File | Apple iTunes | Apple |
| .MPGA | RealNetworks | Lydfiler | MPEG-1 Layer 3 Audio File | Apple iTunes | Apple |
| .MPKG | Open Source | Komprimerede filer | Meta Package File | Apple OS X | Apple |
| .MPR | Open Source | Datafiler | Bibexcel Data | Apple iTunes | Apple |
| .MPS | IBM | Datafiler | Mathematical Programming System File | Apple TextEdit | Apple |
| .MPV | Moving Picture Experts Group | Videofiler | MPEG Elementary Stream Video File | PentaLoop PlayerXtreme Media Player | Apple |
| .MPV2 | Roxio | Videofiler | MPEG-2 Video Stream | Apple QuickTime Player | Apple |
| .MQV | Sony | Videofiler | Sony Movie Format File | Apple QuickTime Player | Apple |
| .MRF | Apple | Skrifttypefiler | Macintosh Font File | Apple OS X | Apple |
| .MRW | Konica Minolta | Kamera Ubehandlede Filer | Minolta Raw Image File | Apple Photos | Apple |
| .MSG2 | Apple | Datafiler | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MSL | Microsoft Corporation | Udviklerfiler | Mapping Specification Language File | Apple TextEdit | Apple |
| .MSP | Microsoft Corporation | Systemfiler | Windows Installer Patch | Apple AppleWorks | Apple |
| .MSPX | Microsoft Corporation | Webfiler | Microsoft ASP.NET Web Page | Safari | Apple |
| .MTS | Sony | Videofiler | AVCHD Video File | Apple Final Cut Pro | Apple |
| .MW | Apple | Tekstfiler | MacWrite Text Document | MacWrite | Apple |
| .MXF | SMPTE | Videofiler | Material Exchange Format File | Apple QuickTime Player | Apple |
| .MXML | Adobe Systems Incorporated | Udviklerfiler | Flex MXML Component | Apple TextEdit | Apple |
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