| 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 | Pegasus Mail Sub Directory |
| mail | NeoPlanet Mail Data |
| maildb | MSN Mail Database |
| mailloc | Mac OS X Finder Mail Internet Location |
| mailstationery | Apple Mail Stationery Data |
| mailtoloc | Mac OS X Finder Mail Internet Location |
| mailview | Microsoft Mail View Data |
| main | FileMaker Pro Dictionary Data |
| maj | CAMduct Job Data |
| maker | Adobe FrameMaker Data |
| mal | RSView Machine Edition Alarms Data |
| mamc | Auto Mouse Click Script |
| maml | Microsoft Assistance Markup Language Data |
| mamp | MAMP Related Data |
| man | AquaCrop Field Management Data |
| man | Blaise Manipula Setup Data |
| man | Windows Mandatory User Profile Data |
| manifest | Steam Manifest Data |
