| mlp | Martus Language Pack |
| mlp | mAirList Desktop Playlist |
| mls | mAirList Script |
| mlt | mAirList Desktop Template |
| mlw | MainLog Data |
| mlx | Meshlab Filter Script |
| mlz | MLZ Data |
| mm | Matrix Market File |
| mm | FreeMind MindMap |
| mm3 | Mortgage Minder v3 Data File |
| mm3d | Misfit Model 3D Model |
| mm6 | Money Manager 6 |
| mmap | MindManager Map File |
| mmas | MindManager Theme |
| mmat | MindManager Map Template |
| mmb | Mobile Master Backup |
| mmc | Microsoft ClipArt Gallery Catalog |
| mmcollection | Mail Manager Collection |
| mmd | Media Processing Server Audio Data |
| mmd | mAirList Metadata |
| mmdb | Molecular Modeling Database |
| mmdb | MaxMind GeoIP2 Database |
| mme | MIME Encoded Data |
| mmi | Media Processing Server Index File |
| mmjb | MusicMatch Jukebox Data |
| mml | Media Catalog MML File |
| mmmp | MindManager Map Part |
| mmms | MindManager Map Marker List |
| mmo | Memory-Map Overlay File |
| mmr | Inertial Explorer Mounting Data |
