| Extension |
File Type |
File Description |
| .l | Audio | Left Audio Channel File |
| .l | Data | Game of Life File |
| .lab | Page Layout | WordPerfect Label Definition File |
| .lasso | Web | Lasso Database-Driven Web Page |
| .latex | Text | LaTeX Document |
| .lbi | Developer | Dreamweaver Library Item |
| .lbm | Raster Image | Deluxe Paint Bitmap Image |
| .lbr | Compressed | LU Library Archive |
| .lbs | Developer | Omnis Library |
| .lbt | Text | FoxPro Label Memo |
| .lbx | Data | FoxPro Label Definition File |
| .lcd | Disk | CDSpace Emulated Disk Image |
| .lcd | Data | ABBYY Language File |
| .lcf | Data | ArchiCAD Library Container File |
| .lck | Misc | Program Lock File |
| .lcm | Data | Lipikar Custom Map File |
| .ldb | Misc | Microsoft Access Lock File |
| .ldb | Game | Max Payne Level File |
| .lds | Developer | Linux Compile Time Header File |
| .lgh | Data | HMI Historical Log File |
| .lgi | Data | Multimedia Logic File |
| .lgo | Developer | Logo Instructions File |
| .lha | Compressed | LHARC Compressed Archive |
| .lhs | Developer | Literate Haskell Script |
| .lib | Data | Generic Data Library |
| .lic | Settings | Software License |
| .lid | Misc | Kodak EasyShare Album File |
| .lif | Data | TurboTax Information Archive |
| .lin | Vector Image | AutoCAD Linetype File |
| .link | Misc | iPod Link File |
| .linx | Misc | iPod Links Folder |
| .lis | Developer | VAX Program Listing |
| .lis | Text | SQR Output File |
| .lit | Text | eBook File |
| .lit | Developer | Literate Haskell Script |
| .lix | Data | Logos Library System File |
| .llb | Data | LabVIEW Library File |
| .llx | Backup | LabVIEW VI Library Backup File |
| .lmu | Game | RPG Maker Map File |
| .lng | Plugin | Acrobat Language Plug-in |
| .lnk | Misc | File Shortcut |
| .lnt | Developer | PC-lint/FlexeLint Configuration File |
| .lnt | Data | LiveNote Case File |
| .lnx | Disk | Atari Lynx ROM |
| .lnx | Compressed | Commodore 64 Lynx Archive |
| .log | Text | Log File |
| .lop | Settings | Mastercook Layout File |
| .lp2 | Text | iLEAP Word Processing Document |
| .lp7 | Data | LP7 Digitally Signed File |
| .lproj | Developer | Localized Project Folder |
| .lqr | Compressed | SQ Compressed LBR Archive |
| .lrc | Text | Lyrics File |
| .lsd | Game | RPG Maker Game Save File |
| .lsf | Data | Logos Library System File |
| .lsf | Video | Streaming Media Format |
| .lso | Audio | Logic Audio Project |
| .lsp | Developer | Lisp Program Source Code |
| .lsp | Data | LANsurveyor Poll List |
| .lsr | Data | LANsurveyor Report |
| .lst | Text | Data List |
| .lst | Text | FoxPro Documenting Wizard List |
| .lsu | Data | LANsurveyor Map |
| .lsw | Game | RPG Maker Saved Game File |
| .lsx | Video | Streaming Media Shortcut |
| .lt2 | 3D Image | Poser Light Set File |
| .ltr | Text | Letter File |
| .ltz | 3D Image | Compressed Poser Light Set File |
| .lua | Developer | Lua Source File |
| .luf | Text | Lipikar Uniform Format File |
| .luxb | Game | Lux Map File |
| .lvp | Audio | Avaya Voice Player Audio File |
| .lwfn | Font | Adobe Type 1 Mac Font File |
| .lwo | 3D Image | LightWave 3D Object File |
| .lwp | Text | Lotus Word Pro Document |
| .lws | 3D Image | LightWave 3D Scene File |
| .lwtp | Misc | LimeWire Theme Pack |
| .lwv | Audio | Linguistically Enhanced Sound File |
| .lyt | Text | TurboTax Install Log File |
| .lyx | Text | LyX Document |
| .lzh | Compressed | LZH Compressed File |
| .lzm | Compressed | Slax Module |
| .lzma | Compressed | LZMA Compressed File |
| .lzo | Compressed | LZO Compressed File |
| .lzx | Compressed | Amiga LZX Compressed File |
