| M | MATLAB Source Code File | Developer Files | 10 | 5 |
| M01 | ComputerEyes Animation File | Graphic Files | 2 | 2 |
| M11 | Microsoft Money 2003 Data | Data Files | 1 | 1 |
| M15 | MPEG Video File | Video Files | 12 | 2 |
| M1A | MPEG-1 Audio File | Audio Files | 4 | 1 |
| M1PG | iFinish Video Clip |
Video Files
| 2 | 1 |
| M1S | Mach3 Macro |
Developer Files
| 1 | 1 |
| M1V | MPEG-1 Video File |
Video Files
| 7 | 1 |
| M2 | PC-98 Game Music File |
Audio Files
| 2 | 2 |
| M21 | AXMEDIS MPEG-21 File |
Video Files
| 2 | 1 |
| M22 | Farallon's MacRecorder Recording File |
Audio Files
| 1 | 1 |
| M2A | MPEG-1 Layer 2 Audio File |
Video Files
| 5 | 1 |
| M2C | IBM Voice Type Languages Newuser File |
Data Files
| 1 | 1 |
| M2D | HTC Manila 2D For Windows Mobile Skin | Settings Files | 1 | 1 |
| M2F | Maxthon Filter Package Data |
Settings Files
| 1 | 1 |
| M2L | Maxthon Language Package | Web Files | 1 | 1 |
| M2O | Modula Fitted Modula2 File |
Data Files
| 1 | 1 |
| M2P | MPEG-2 Program Stream File |
Video Files
| 5 | 2 |
| M2S | Maxthon 2 Browser Skin File |
Settings Files
| 4 | 2 |
| M2T | HDV Video File |
Video Files
| 8 | 1 |
| M2TS | Blu-ray BDAV Video File |
Video Files
| 8 | 1 |
| M2U | Maxthon Layout File | Page Layout Files | 1 | 1 |
| M2V | MPEG-2 Packetized Elementary Stream |
Video Files
| 7 | 1 |
| M3 | Blizzard MDX3 Model File | 3D Image Files | 2 | 1 |
| M3A | Enhanced M3U Playlist |
Audio Files
| 1 | 1 |
| M3D | DIALux 3D Object File |
3D Image Files
| 2 | 2 |
| M3G | Mobile 3D Graphics Program | Executable Files | 1 | 1 |
| M3I | IBM Voice Type Languages Newuser File |
Data Files
| 1 | 1 |
| M3K | Interactive Digital Content File | Compressed Files | 1 | 1 |
| M3P | Mach3 Plugin File | Plugin Files | 1 | 1 |
| M3R | Autodesk Moldflow 3D Fill+Pack Restart Data |
Data Files
| 1 | 1 |
| M3S | Myst III Exile Saved Game | Game Files | 1 | 1 |
| M3U | Media Playlist File |
Audio Files
| 8 | 1 |
| M3U8 | UTF-8 M3U Playlist File |
Audio Files
| 9 | 1 |
| M3V | DJ Mix Pro Playlist |
Audio Files
| 1 | 1 |
| M4 | Macro Processor Library |
Developer Files
| 4 | 1 |
| M4A | MPEG-4 Audio File |
Audio Files
| 7 | 1 |
| M4B | MPEG-4 Audio Book File |
Audio Files
| 4 | 1 |
| M4C | IBM Voice Type Languages Newuser File |
Data Files
| 1 | 1 |
| M4P | iTunes Music Store Audio File |
Audio Files
| 2 | 1 |
| M4R | iPhone Ringtone File |
Audio Files
| 2 | 1 |
| M4S | Myst IV: Revelation Save Game File |
Game Files
| 2 | 2 |
| M4T | Sage MAS 90 Data File |
Data Files
| 1 | 1 |
| M4U | MPEG-4 Playlist |
Video Files
| 5 | 1 |
| M4V | iTunes Video File |
Video Files
| 11 | 1 |
| M4X | SynDEx Executive Macro |
Developer Files
| 1 | 1 |
| M5D | Unknown File Type | Uncommon Files | 1 | 1 |
| M68 | Turbo Pascal DOS File |
Developer Files
| 1 | 1 |
| M75 | MPEG Video File |
Video Files
| 11 | 1 |
| M8 | Heretic II MipMap Image File |
Game Files
| 1 | 1 |
| M8M | 8mam8 Game Data File |
Game Files
| 1 | 1 |
| M9D | Unknown File Type |
Uncommon Files
| 1 | 1 |
| MA | Maya Project File |
3D Image Files
| 3 | 3 |
| MA1 | Monarch Audio File |
Audio Files
| 1 | 1 |
| MA2 | Diablo II Map File |
Game Files
| 3 | 3 |
| MA3 | Harvard Graphics Macro |
Developer Files
| 1 | 1 |
| MAB | Mozilla Address Book |
Uncommon Files
| 4 | 2 |
| MAC | MacPaint Image | Raster Image Files | 8 | 2 |
| MAC2 | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| MACHACHA | Split Control File | Backup Files | 1 | 1 |
| MACRO | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| MACWRITE | MacWrite Text Document | Text Files | 1 | 1 |
| MAD | Electronic Arts Madcow Movie File |
Game Files
| 5 | 2 |
| MAE | My Avatar Editor Character File |
Game Files
| 2 | 2 |
| MAEGZ | Compressed Molecular Model File |
Uncommon Files
| 1 | 1 |
| MAF | Mutation Annotation Format File |
Data Files
| 4 | 2 |
| MAFF | Mozilla Archive Format File |
Web Files
| 1 | 1 |
| MAG | Access Diagram Shortcut File |
Uncommon Files
| 2 | 2 |
| MAGICS | Magics Project File | CAD Files | 1 | 1 |
| MAGNET | Magnet Link Text File |
Text Files
| 3 | 1 |
| MAI | Microsoft Mail File |
Data Files
| 2 | 2 |
| MAIL | NeoPlanet Mail Client File |
Data Files
| 1 | 1 |
| MAILABVIEW | MS AddressBook File |
Data Files
| 1 | 1 |
| MAILBOX | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| MAILHOST | MSN Mailhost Settings File |
Settings Files
| 1 | 1 |
| MAIN | FileMaker Dictionary Data |
Data Files
| 1 | 1 |
| MAJ | Camduct Job File |
Data Files
| 1 | 1 |
| MAK | Makefile |
Developer Files
| 4 | 1 |
| MAKEFILE | Makefile |
Developer Files
| 4 | 1 |
| MAL | MadAppLauncher Configuration File |
Settings Files
| 1 | 1 |
| MAM | Microsoft Access Macro |
Executable Files
| 1 | 1 |
| MAN | Unix Manual |
Text Files
| 16 | 2 |
| MANIFEST | Windows Application Manifest File | System Files | 10 | 3 |
| MAP | Quake Engine Map File |
Game Files
| 36 | 26 |
| MAPIMAIL | Send To Mail Recipient |
System Files
| 1 | 1 |
| MAPLET | Maplet World File |
Game Files
| 1 | 1 |
| MAPS | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| MAPX | Mapjects Client Webparts File |
Web Files
| 1 | 1 |
| MAQ | Microsoft Access Query | Database Files | 1 | 1 |
| MAR | Microsoft Access Report |
Database Files
| 5 | 4 |
| MARCH | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) |
Data Files
| 3 | 1 |
| MARIO | Golden Orchard Apple II CD Rom File |
Data Files
| 2 | 1 |
| MARKDOWN | Markdown Documentation File |
Developer Files
| 7 | 1 |
| MAS | rFactor Track File |
Game Files
| 5 | 5 |
| MASK | SpeedGrade Color Mask File |
Settings Files
| 1 | 1 |
| MASTER | ASP.NET Master Page |
Web Files
| 2 | 1 |
| MAT | MATLAB MAT-File |
Data Files
| 6 | 5 |
| MAU | Media Attachment Unit |
Uncommon Files
| 1 | 1 |
| MAV | Access View File |
Database Files
| 1 | 1 |
| MAW | Access Data Access Page |
Database Files
| 1 | 1 |
of 7 
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