| mmx | Oracle Forms Menu Module Executable |
| mn8 | SpaceMapper MN8 Script |
| mnft | Java Manifest File |
| mno | Dreamweaver Design Notes Data |
| mnt | Visual FoxPro Menu Memo |
| mntr | ANSYS Monitor Data |
| mnw | WinBatch Menu Data |
| mnx | Visual FoxPro Menu Template |
| mo | GNU Gettext Machine Object File |
| mobileprovision | Provisioning Profile |
| moc | QT Meta-Object Compiler File |
| mods | Mozilla XULRunner Data |
| mof | Managed Object Format File |
| mom | Xcode Managed Object Model |
| momd | Xcode Managed Object Model Bundle Package |
| moo | MoonRock Source Code |
| morph | Squeak MORPH Data |
| mos | Xpress Mosel Source Model |
| mosel | Xpress Mosel Source Model |
| motion | Amazon Lumberyard Motion Data |
| motionset | Amazon Lumberyard Motion Set Data |
| mp | MetaPost Source Code |
| mpas | microPascal Pro for PIC Unit |
| mpd | ABC Monadic Predicate Data |
| mpkt | MOPEKS Trial File |
| mplf | CodeWarrior Library |
| mpp | Modgen Source Code |
| mpr | Visual FoxPro Menu Program |
| mprog | FTDI MProg Data |
| mps | Mathematical Programming System Model |
