| mamc | Auto Mouse Click Script |
| maml | Microsoft Assistance Markup Language Data |
| mamp | MAMP Related Data |
| man | AquaCrop Field Management Data |
| map | BrainVoyager QX Map Data |
| map | Hex Workshop Character Map |
| map | Ingres Termcap Mapping Data |
| map | Leadwerks Map Data |
| map | Map Data |
| map | Micrografx Picture Publisher Image Map Data |
| map | NI REAKTOR Wavetable Data |
| map | Poser 3D Map Data |
| map | TECkit Mapping Table |
| map | WAsP Terrain Map |
| map16 | SNES Map16 Tile Data |
| maplet | Maple Maplet File |
| maplib | Mscape Map Data |
| mapx | MapDotNet UX Map File |
| mar | Pegasus Mail Attribute Record Data |
| marker | Microsoft Windows 10 System Data |
| markers | BEAGLE Markers Data |
| marshal | Marshal Data Migration Model |
| mash | Java Mashing Data |
| mask | Adobe SpeedGrade Color Mask |
| mat | Altair FEKO Matrix Element Data |
| mat | Animation Master Material Data |
| mat | Bryce 3D Material Data |
| mat | CRiSP Harvest Maturation Data |
| mat | Kerkythea Material Data |
| mat | Poser 3D Material Data |
