| lib | Visual C++ Import Library |
| license | Visual Studio Binary License Data |
| licx | Visual Studio License Text |
| lif | HP-UX LIF File |
| lin | µVision Linker Control Data |
| link | Eclipse Link File |
| linq | LINQPad Source Code |
| lipg | LiPG Parser |
| lis | HP OpenVMS List Data |
| lisp | Lisp Source Code |
| litcoffee | CoffeeScript Literate Script |
| livecode | LiveCode Stack File |
| lkc | LTIB Top Level Config |
| lkf | Code Composer Studio Linker Options Data |
| lkf | ST Visual Develop IDE Link Data |
| lkr | MPLAB Linker Data |
| lks | Lookout Direct Source Code |
| llb | LabVIEW Library |
| llf | IITM Local Language File |
| llp | VersaPro Compiled Local Logic Block |
| llx | LabVIEW Virtual Instrument Library Backup |
| lmf | Altera Quartus II Library Mapping Data |
| lmo | Lua Machine Objects |
| ln | UNIX Lint Data |
| lnp | uVision Linker Input File |
| lnt | FlexeLint Configuration |
| lo | Interleaf Compiled Lisp |
| loadtest | Microsoft Visual Studio Load Test Data |
| lobster | Lobster Source Code |
| loc | FactoryTalk View Studio Local Message Component File |
