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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .MESSAGES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .METADATA_NEVER_INDEX | Apple | System Files | Spotlight Never Index File | macOS | Apple |
| .METAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MF | Walt Disney Imagineering | Game Files | Gameplay Multifile | Apple TextEdit | Apple |
| .MICE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MID | Open Source | Audio Files | MIDI Audio File | Apple QuickTime Player | Apple |
| .MIDI | Synthesia LLC | Audio Files | MIDI File | Apple QuickTime Player | Apple |
| .MIM | Internet Engineering Task Force | Encoded Files | Multi-Purpose Internet Mail Message File | Apple Mail | Apple |
| .MIME | Various Developers | Encoded Files | Multi-Purpose Internet Mail Extension | Apple Mail | Apple |
| .MISC | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MJP | LG Electronics | Video Files | MJPEG Video File | Apple QuickTime Player | Apple |
| .MKEXT | Apple | System Files | Mac OS X Mach Kernel Extension Memory Cache | macOS | Apple |
| .MKV | Various Developers | Video Files | Matroska Video File | olimsoft OPlayer | Apple |
| .MLTV | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MM | Kodak | Data Files | Kodak EasyShare Thumbnail Cache File | Apple Xcode | Apple |
| .MNU | Autodesk, Inc. | Settings Files | AutoCAD Interface Layout File | Apple TextEdit | Apple |
| .MODEM | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MOM | Apple | Developer Files | Managed Object Model | Apple Xcode | Apple |
| .MOO | Apple | Video Files | Apple QuickTime Movie Clip File | Apple QuickTime Player | Apple |
| .MOOV | Apple | Video Files | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOUSE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MOV | Apple | Video Files | Apple QuickTime Movie | Apple QuickTime Player | Apple |
| .MOVEMON | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .MOVIE | Apple | Video Files | QuickTime Movie File | Apple QuickTime Player | Apple |
| .MP1 | RealNetworks | Audio Files | MPEG-1 Layer 1 Audio File | Apple iTunes | Apple |
| .MP2 | New World Computing | Game Files | Heroes Of Might And Magic II Map File | Apple iTunes | Apple |
| .MP21 | AXMEDIS Products and Services | Video Files | AXMEDIS MPEG-21 Object | Apple QuickTime Player | Apple |
| .MP2V | Roxio | Video Files | MPEG-2 Video File | Apple QuickTime Player | Apple |
| .MP3 | Moving Picture Experts Group | Audio Files | MP3 Audio File | Apple iTunes | Apple |
| .MP4 | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Apple iTunes | Apple |
| .MP4V | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Apple iTunes | Apple |
| .MPA | Unknown Developer | Audio Files | MPEG-2 Audio File | Apple iTunes | Apple |
| .MPE | Unknown Developer | Video Files | MPEG Movie | Apple iTunes | Apple |
| .MPEG | Unknown Developer | Video Files | MPEG Movie | Apple iTunes | Apple |
| .MPG | Moving Picture Experts Group | Video Files | MPEG Video File | Apple iTunes | Apple |
| .MPG4 | Moving Picture Experts Group | Video Files | MPEG-4 Video File | Apple iTunes | Apple |
| .MPGA | RealNetworks | Audio Files | MPEG-1 Layer 3 Audio File | Apple iTunes | Apple |
| .MPKG | Open Source | Compressed Files | Meta Package File | Apple OS X | Apple |
| .MPR | Open Source | Data Files | Bibexcel Data | Apple iTunes | Apple |
| .MPS | IBM | Data Files | Mathematical Programming System File | Apple TextEdit | Apple |
| .MPV | Moving Picture Experts Group | Video Files | MPEG Elementary Stream Video File | PentaLoop PlayerXtreme Media Player | Apple |
| .MPV2 | Roxio | Video Files | MPEG-2 Video Stream | Apple QuickTime Player | Apple |
| .MQV | Sony | Video Files | Sony Movie Format File | Apple QuickTime Player | Apple |
| .MRF | Apple | Font Files | Macintosh Font File | Apple OS X | Apple |
| .MRW | Konica Minolta | Camera Raw Files | Minolta Raw Image File | Apple Photos | Apple |
| .MSG2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .MSL | Microsoft Corporation | Developer Files | Mapping Specification Language File | Apple TextEdit | Apple |
| .MSP | Microsoft Corporation | System Files | Windows Installer Patch | Apple AppleWorks | Apple |
| .MSPX | Microsoft Corporation | Web Files | Microsoft ASP.NET Web Page | Safari | Apple |
| .MTS | Sony | Video Files | AVCHD Video File | Apple Final Cut Pro | Apple |
| .MW | Apple | Text Files | MacWrite Text Document | MacWrite | Apple |
| .MXF | SMPTE | Video Files | Material Exchange Format File | Apple QuickTime Player | Apple |
| .MXML | Adobe Systems Incorporated | Developer Files | Flex MXML Component | Apple TextEdit | Apple |
| .NAMES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NEF | Nikon | Camera Raw Files | Nikon Electronic Format Camera RAW Image | Apple Photos | Apple |
| .NFL | Nokia | Data Files | Nokia Flash Lite Package | Apple Archive Utility | Apple |
| .NFO | Microsoft Corporation | System Files | System Information File | Apple TextEdit | Apple |
| .NIB | Apple | Developer Files | Interface Builder User Interface File | Apple Xcode | Apple |
| .NORMAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NOTEPAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NOW | The Document Foundation | Text Files | Readme Text Document File | Apple Pages | Apple |
| .NUMBERS | Apple | Spreadsheet Files | Numbers Spreadsheet File | Numbers | Apple |
| .NUWAGE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .NVF | Creative Technology Ltd. | Audio Files | Creative Labs NVF Audio File | Apple iTunes | Apple |
| .OCR | URUWORKS | Uncommon Files | Subtitle Workshop OCR Script | Apple TextEdit | Apple |
| .OCTEST | Apple | Developer Files | Xcode Objective-C Unit Test Bundle | Apple Xcode | Apple |
| .ODC | Microsoft Corporation | Settings Files | Office Data Connection File | Apple Safari | Apple |
| .ODT | Oracle Corporation | Text Files | OpenDocument Text Document | Apple TextEdit | Apple |
| .OEB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Apple Pages | Apple |
| .OGX | Xiph.Org | Video Files | Ogg Vorbis Multiplexed Media File | Apple QuickTime Player | Apple |
| .OMF | Avid Technology | Audio Files | Open Media Framework File | Apple Final Cut Pro | Apple |
| .ONLINE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .OR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ORF | Olympus Corporation | Camera Raw Files | Olympus RAW File | Apple Photos | Apple |
| .OSMALLER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .OSX | Apple | Executable Files | PowerPC Executable File | macOS | Apple |
| .OUT | Open Source | Executable Files | Compiled Executable File | Apple TextEdit | Apple |
| .OVW | Apple | Audio Files | Logic Pro Overview File | Logic Pro X | Apple |
| .P10 | Open Source | Uncommon Files | Certificate Request File | Apple Mail | Apple |
| .P38 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .P7B | Microsoft Corporation | Web Files | PKCS #7 Certificate File | Apple Keychain Access | Apple |
| .P7C | Microsoft Corporation | Web Files | PKCS #7 Certificate File | Apple Keychain Access | Apple |
| .P7S | Unknown Developer | Encoded Files | PKCS #7 Signature File Format | Apple Mail | Apple |
| .PAC | NetScape | Web Files | Proxy Auto-Config File | Apple Safari | Apple |
| .PAGE | Hybrid Server Pages Group | Web Files | HybridJava Web Page | Apple TextEdit | Apple |
| .PAGES | Apple | Text Files | Apple Pages Document | iWork | Apple |
| .PAINT | Apple | Uncommon Files | MacPaint Bitmap Graphics | MacPaint | Apple |
| .PANIC | Open Source | System Files | Kernel Panic File | macOS | Apple |
| .PANO | Microsoft Corporation | Raster Image Files | Camera Panoramic Picture | Apple QuickTime Player | Apple |
| .PARSER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PASCAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PASS | Apple | Data Files | Xcode Wallet Data | Apple Xcode | Apple |
| .PATCHER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PATH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PAUSE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PAX | Portable Operating System Interface (POSIX) Consortium | Compressed Files | PAX Archive | Apple Archive Utility | Apple |
| .PAYROLL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PBPROJ | Apple | Developer Files | Project Builder Project | Apple Xcode | Apple |
| .PCH | MSC Software | Data Files | Nastran Punch Output File | Apple Xcode | Apple |
| .PCS | Pfaff | CAD Files | Pfaff Embroidery File | Apple OS X | Apple |
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