| mer | FactoryTalk View Studio Runtime Application |
| mex | MATLAB Executable |
| mexsg | MATLAB Executable |
| mexw32 | MATLAB Executable |
| mf | Java Manifest File |
| mfa | Multimedia Fusion Source |
| mfa | Multimedia Fusion Development Source Data |
| mfcribbon-ms | MFC Ribbon Resource |
| mfd | ABC Monadic Functions Data |
| mfl | Localized Managed Object Format File |
| mfo | Perl ModInfo Descriptor |
| mfps | MFP Script |
| mft | Java Manifest File |
| mfu | MobileFrame Update Package |
| mfv | MobileFrame Device Pack |
| mfw | MobileFrame Workflow Pack |
| mfx | Multimedia Fusion Extension |
| min | Freemacs Mint Source Code |
| mingw | MinGW Makefile |
| miz | Mizar Article |
| mk | GNU Makefile |
| ml | OCaml Source Code |
| mlapp | MATLAB Application Package |
| mlb | FoxPro 2 for Macintosh Library |
| mlc | Message Tools for NetWare Source Code |
| mlh | Message Tools for NetWare Source Code |
| mli | OCaml Interface Source |
| mlib | MATLAB Shared Library |
| mlua | MetaLua Source Code |
| mlv | LabVIEW Mathscript |
