| lzma | LZMA Compressed File |
| lzo | LZOP Compressed File |
| lzop | LZOP Compressed File |
| 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 |
| maz | Autodesk 3D Studio Max Archived Network Rendering Job |
| mb2 | McMyAdmin 2 Backup Archive |
| mbkp | Memeo Instant Backup Archive |
| mbz | Moodle Backup Data |
| mcaddon | Minecraft Addon Package |
| mcb | McMyAdmin Backup Archive |
| mcpack | Minecraft Resource Pack |
| mdbackup | iPhone Data Backup |
| mdc | MedDC Mail Pouch Data |
| mddata | iPhone Backup Archive |
| meo | MEO Encrypted Archive |
| mfp | MobileFrame Package |
| mig | Windows USMT Backup Archive |
| mint | Linux Mint Installer |
| mkz | PokerOffice Database Backup |
| mlpkginstall | MATLAB Support Package |
| mltbx | MATLAB Toolbox Package |
| mmbak | Money Manager Backup Archive |
| mmip | MediaMonkey Installation Package |
| mou | WinMount Archive |
