| m7a | MapKing Map Data |
| m7c | Yamaha M7CL Digital Mixing Console Data |
| m98 | Nokia Mediamaster 9800S Satellites Data |
| m99 | MicroStation Modification User Resource File |
| ma3 | Harvard Graphics 3.0 Macro |
| ma4 | Vector NTI DNA Archive |
| maa | MMANA Antenna Data |
| mab | Mozilla Address Book |
| mac | Minitab Macro Data |
| mac | PATCHMASTER Macro File |
| mac | PTC Creo Machine Data |
| mac | SmartWare Macro File |
| macappl | MacDrive Data |
| macbin | Macbinary Encoded |
| machacha | MacHacha Split Control Data |
| macro | Tecplot 360 Macro Data |
| macs | MADRIX Encrypted Script |
| mad | Microsoft Access Module Shortcut |
| mads | Metadata Authority Description Schema Data |
| madx | fotoFlag Meta Action Definition XML |
| mae | Maestro Molecular Model |
| maegz | Maestro Compressed Molecular Model |
| mag | Adobe Photoshop Magenta Color Separation Data |
| mag | EcoWin Chart |
| mag | Magic Circuit Layout Data |
| magiwol | MagiWOL Data |
| mai | Microsoft Mail |
| mai | Pegasus Mail Sub Directory |
| mail | NeoPlanet Mail Data |
| maildb | MSN Mail Database |
