| lzr | Crunched LBR Archive |
| lzss | LZSS Compressed Data |
| lzw | LZW Compressed Amiga Archive |
| lzx | Amiga LZX Compressed Archive |
| m | Mathematica Package |
| mabk | Lenovo MOTO Smart Assistant Backup Data |
| maff | Mozilla Archive Format File |
| mb2 | McMyAdmin 2 Backup Archive |
| mbkp | Memeo Instant Backup Archive |
| mcaddon | Minecraft Addon Package |
| mcb | McMyAdmin Backup Archive |
| mcpack | Minecraft Resource Pack |
| mdbackup | iPhone Data Backup |
| mddata | iPhone Backup Archive |
| meo | MEO Encrypted Archive |
| mfp | MobileFrame Package |
| mig | Windows USMT Backup Archive |
| mint | Linux Mint Installer |
| mkz | PokerOffice Database Backup |
| mltbx | MATLAB Toolbox Package |
| mmbak | Money Manager Backup Archive |
| mmip | MediaMonkey Installation Package |
| mou | WinMount Archive |
| mozlz4 | Mozilla Firefox Portable Data |
| mpkg | Mac OS X Metapackage |
| mplumpack | Luminar Custom Presets Package |
| mpzip | NI Multisim Package |
| mqxlz | memoQ Compressed XLIFF Archive |
| mrback | Macrium Reflect Backup Data |
| mrbak | Macrium Reflect File and Folder Backup |
