| kge | KGB Archiver Encrypted |
| knar | KNIME Workflow Archive |
| kodi | Kodi Update Data |
| kry | Krypter Encrypted Data |
| ksa | Kubotek KeyCreator Settings Archive |
| ksp | KeyShot Package |
| kva | KVIrc Compressed Archive |
| kwt | KVIrc Theme Pack |
| kz | KuaiZip Compressed File |
| lal | Liberkey Core Update File |
| lbf | LG Phone Backup Archive |
| lbr | LU Library Archive |
| lcb | Living Cookbook Backup |
| lemon | LemonShare.net Download |
| lg | Archangel Compressed Archive |
| lgbackup | LG G7 Phone Backup Archive |
| lgu | LG Windows CE Device Firmware Update |
| Renault R-Link Firmware Update Package |
| lha | LHarc Compressed Archive |
| lharc | LHarc Compressed Archive |
| lhw | LhWarp Compressed Archive |
| lhz | LHarc Compressed Archive |
| lif | CA-Clipper Compressed Archive |
| liz | Liberty Instruments LAUD Program Update |
| lja | ljArchive Archive |
| lks | Liberkey Installation Package |
| lnx | Commodore 64 Lynx Archive |
| locker | NordLocker Encrypted Archive |
| lok | FileWrangler Locked Archive |
| WinGuard Pro Lok Archive |
| lou | Liquidware LouZip Archive |
| lpaq | LPAQ Compressed Archive |
| lpaq1 | LPAQ1 Compressed Archive |
| lpaq5 | LPAQ5 Compressed Archive |
| lpaq8 | LPAQ8 Compressed Archive |
| lpk | Lazarus Package |
| lpkg | Appspace Language Package |
| Liferay Package |
| lpx | NetSim Lab Package |
| lqr | Squeezed LBR Archive |
| lrp | Linux Router Project Package |
| lrz | Long Range Zip Compressed Archive |
| lxv | Lexar Secure II Encrypted Archive |
| lz | Lzip Compressed File |
| lz4 | LZ4 Compressed Data |
| lzb | LZB Archive |
| lzg | LZG Compressed Data |
| lzh | LHarc Compressed Archive |
| lzip | Lzip Compressed File |
| lzj | Atari Jaguar LZSS Compressed Data |
| lzm | Slax Module |
| 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 |
| mc$ | Magic Cap Xchange Package |
| mcaddon | Minecraft Addon Package |
| mcb | McMyAdmin Backup Archive |
| mcp | MSN Content Plus Installation Archive |
| mcpack | Minecraft Resource Pack |
| md | MDCD Compressed Archive |
| 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 |
| mlappinstall | MATLAB App Installer Package |
| mlpkginstall | MATLAB Support Package |
| mltbx | MATLAB Toolbox Package |
| mmbak | Money Manager Backup Archive |
| mmip | MediaMonkey Installation Package |
| mou | WinMount Archive |
| mozlz4 | Mozilla Firefox Portable Data |
| mp | SCOM Management Pack |
| mpb | SCOM Management Pack Bundle |
| 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 |
| mrex | Macrium Reflect Exchange Backup |
| mrimg | Macrium Reflect Disk Image |
| mrpack | Modrinth Modpack Archive |
| mrsql | Macrium Reflect SQL Backup |
| msi | Microsoft Windows Installer Package |
| msix | MSIX Package |
