| Extension |
File Type |
File Description |
| .l | Audio | Left Audio Channel File (Most common) |
| .l6t | Data | Line 6 Tone File |
| .la | Audio | Lossless Audio File |
| .lab | Page Layout | WordPerfect Label Definition File |
| .lang | Settings | Skype Language File |
| .lasso | Web | Lasso Database-Driven Web Page |
| .latex | Text | LaTeX Document |
| .lbc | Web | Cloaked Affiliate Link Builder Saved Link |
| .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 |
| .lbu | Settings | Cloaked Affiliate Link Builder Settings File |
| .lbx | Data | FoxPro Label File |
| .lcd | Disk | CDSpace Emulated Disk Image (Most common) |
| .lcf | Data | ArchiCAD Library Container File |
| .lck | Misc | Program Lock File |
| .lcm | Data | Lipikar Custom Map File |
| .ldb | Misc | Microsoft Access Lock File (Most common) |
| .ldif | Data | LDAP Data Interchange Format File |
| .lds | Developer | Linux Compile Time Header File |
| .lemon | Compressed | LemonShare.net Download |
| .lgc | Data | SimpleK Database File |
| .lgf | Data | PMSCAN Log File |
| .lgh | Data | HMI Historical Log File |
| .lgi | Data | Multimedia Logic File |
| .lgo | Developer | Logo Instructions File |
| .lgp | Game | Final Fantasy Media Archive |
| .lha | Compressed | LHARC Compressed Archive |
| .lhs | Developer | Literate Haskell Script |
| .lib | Data | Generic Data Library |
| .lic | Settings | Software License |
| .licenses | Developer | Visual Studio Licensed Classes File |
| .licx | Developer | Visual Studio License File |
| .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 (Most common) |
| .lit | Text | eBook File (Most common) |
| .lix | Data | Logos Library System File (Most common) |
| .ll | Game | List & Label Preview File |
| .llb | Data | LabVIEW Library File |
| .llx | Backup | LabVIEW VI Library Backup File |
| .lms | Data | LenMus Score File |
| .lmu | Game | RPG Maker Map File |
| .lng | Plugin | Acrobat Language Plug-in |
| .lnk | System | File Shortcut |
| .lnt | Developer | PC-lint/FlexeLint Configuration File (Most common) |
| .lnx | Disk | Atari Lynx ROM (Most common) |
| .log | Text | Log File |
| .logonvista | Misc | LogonStudio Windows Vista Logon Screen |
| .logonxp | Misc | LogonStudio Windows XP Logon Screen |
| .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 (Most common) |
| .lsl | Data | LightScribe Label |
| .lso | Audio | Logic Audio Project |
| .lsp | Developer | Lisp Program Source Code (Most common) |
| .lsr | Data | LANsurveyor Report |
| .lst | Text | Data List (Most common) |
| .lsu | Data | LANsurveyor Map |
| .lsw | Game | RPG Maker Saved Game File |
| .lsx | Video | Streaming Media Shortcut |
| .lt2 | Image | Poser Light Set File |
| .ltf | Misc | Frogans Shortcut File |
| .ltr | Text | Letter File |
| .ltz | Image | Compressed Poser Light Set File |
| .lua | Developer | Lua Source File |
| .luf | Text | Lipikar Uniform Format File |
| .luxb | Game | Lux Map File |
| .lvl | Game | Game Level File |
| .lvp | Audio | Avaya Voice Player Audio File |
| .lw4 | Data | Lightwright File |
| .lwfn | Font | Adobe Type 1 Mac Font File |
| .lwo | Image | LightWave 3D Object File |
| .lwp | Text | Lotus Word Pro Document |
| .lws | Image | LightWave 3D Scene File |
| .lwtp | Misc | LimeWire Theme Pack |
| .lwv | Audio | Linguistically Enhanced Sound File |
| .lxa | Misc | Microsoft Speech Lexicon File |
| .lxf | Image | LEGO Digital Designer Model File |
| .lxfml | Text | LEGO Digital Designer XML File |
| .lyr | Misc | ArcView Layer 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 |
