| lcb | Living Cookbook Backup |
| lg | Archangel Compressed Archive |
| lgbackup | LG G7 Phone Backup Archive |
| lgu | LG Windows CE Device Firmware Update |
| lgu | 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 |
| lok | 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 |
| lpkg | 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 |
