| mhd | ITK MetaImage Header |
| mhe | Hackshield Heuristic Engine File |
| mhg | MHEG-5 Multimedia Data |
| mhl | Media Hash List |
| mhm | Microsoft Mouse and Keyboard Center Macro |
| mhp | Maths Helper Plus Data |
| mhr | OpenAL Soft HRTF Data |
| mhs | Xilinx Microprocessor Hardware Specification |
| mhtmlenx | Egis Encrypted MHTML Data |
| mi2 | AutoDesk Softimage Data |
| miaf | InstallAware Setup Dialog Rules |
| mib | SNMP MIB File |
| mibs | PLINK Identity-by-state Matrix Data |
| midata | Mine-imator Data |
| midicodec | Reason Midi Codec Data |
| mif | Elmer Mesh Generator Input File |
| mif | ImageMagick Graphics Data |
| mif | mAirList Inline File |
| mif | Xilinx CORE Generator Memory Initialization File |
| miframes | Mine-imator Keyframes Data |
| migrated | Microsoft Windows Migrated Data |
| migtable | Microsoft Windows Migration Table Data |
| mihb | eXtendable Wad Editor MIHB Data |
| miigx | SaveGame Manager GX Mii Data |
| mil | PTC Creo Milling Parameter Data |
| milanguage | Mine-imator Language Data |
| millpst | BobCAD-CAM Post Processor Data |
| mim | MIME Encoded Data |
| mime | MIME Encoded Data |
| mimodel | Mine-imator Model Data |
| minc | PokeMini Color Data |
| mindnode | MindNode Document |
| mini | Mini V Presets Data |
| minibank | Mini V Presets Data |
| minidsf | eXtendable Wad Editor MINIDSF Data |
