| mez | RealArcade Game Information Data |
| mf | Adobe FrameMaker Maker Data |
| mf | Open Virtual Machine Format Manifest |
| mf | Zemax Merit Function Data |
| mf4 | ASAM Measurement Data Format File |
| mfalist | Ashampoo Photo Commander Slideshow List |
| mfasl | Mozilla Fastload File |
| mfc | CMUSphinx Features Data |
| mfcc | HTK Mel-Frequency Cepstral Coefficient Data |
| mfd | Multiframe Design |
| mfe | 3ds Max Character Studio Motion Flow Graph Data |
| mfe | MobileFrame Enterprise Data |
| mff | EGI Metafile Format Data |
| mfg | Esko ArtiosCAD Manufacturing Data |
| mfg | Pro/ENGINEER Manufacturing Data |
| mfg | PTC Creo Manufacturing Process Data |
| mfi | MODFLOW Data Input Program |
| mfi | Windows 98 Resource Kit Data |
| mfil | World of Warcraft Software Update |
| mfj | MOBCAL Input Data |
| mfl | MADRIX Fixture Library |
| mfl | ModFit LT Analysis Report |
| mfl | Mozilla Fastload File |
| mfn | MODFLOW Name Dataset |
| mfo | MediaFACE Online Saved File |
| mfo | MobileFrame Object Data |
| mfr | Moldflow Result |
| mfs | MetFS Encrypted File System |
| mfst | Symantec Endpoint Protection Definitions Manifest Data |
| mft | Microsoft Windows NTFS Master File Table |
| mftpkg | MacFamilyTree Project Package |
| mfx | MADRIX Fixture Fix Data |
| mfxp | NI Maschine v1 Effects Plug-in Presets Data |
| mg | MetaGuide Setup Data |
| mga4 | Mageia Linux 4 Data |
