| Extension |
File Type |
File Description |
| .l | Data | Game of Life File |
| .l | Audio | Left Audio Channel File |
| .l | Developer | Lex Source File |
| .l3d | Game | Black & White Graphics File |
| .l6t | Data | Line 6 Tone File |
| .la | Audio | Lossless Audio File |
| .lab | Page Layout | WordPerfect Label Definition File |
| .laccdb | Data | Microsoft Access Lock File |
| .lang | Settings | Skype Language File |
| .las | Data | LIDAR Data Exchange File |
| .lasso | Web | Lasso Database-Driven Web Page |
| .latex | Text | LaTeX Document |
| .lay | Settings | MAME Layout File |
| .lay | Settings | Rhino 3D Layer State File |
| .lay | Data | Tecplot Layout File |
| .lay | Misc | DVD Studio Pro Layout File |
| .layout | Settings | Code::Blocks Workspace Layout File |
| .lbc | Web | Cloaked Affiliate Link Builder Saved Link |
| .lbi | Developer | Dreamweaver Library Item |
| .lbl | Data | NiceLabel Template File |
| .lbl | Page Layout | dBASE Label File |
| .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 |
| .lcb | Backup | Living Cookbook Backup File |
| .lcd | Disk Image | CDSpace Emulated Disk Image |
| .lcd | Data | ABBYY Language File |
| .lcf | CAD | ArchiCAD Library Container File |
| .lck | Misc | Program Lock File |
| .lcm | Data | Lipikar Custom Map File |
| .ld2 | Data | Lingoes Dictionary File |
| .ldb | Misc | Microsoft Access Lock File |
| .ldb | Game | Max Payne Level File |
| .ldf | Data | SQL Server Transaction Log File |
| .ldf | Data | Lingoes Dictionary Source File |
| .ldif | Data | LDAP Data Interchange Format File |
| .ldm | 3D Image | VolumeViz Multi-Resolution Volume File |
| .ldr | CAD | LDraw Model File |
| .lds | Developer | Binutils LD Linker Script |
| .ldt | CAD | Eulumdat Formatted Luminaire Data File |
| .ldw | Game | Virtual Villagers Saved Game File |
| .lemon | Compressed | LemonShare.net Download |
| .lex | Data | Adobe Linguistic Library Data File |
| .lfp | Data | IPRO LFP File |
| .lgc | Database | SimpleK Database File |
| .lgf | Data | PMSCAN Log File |
| .lgh | Data | HMI Historical Log File |
| .lgi | Data | Multimedia Logic File |
| .lgl | Game | LeechGet Download List |
| .lgl | Data | Large Graph Layout Edge File |
| .lgo | Developer | Logo Instructions File |
| .lgp | Game | Final Fantasy Media Archive |
| .lgt | Settings | Let's Go! Theme File |
| .lha | Compressed | LHARC Compressed Archive |
| .lhs | Developer | Literate Haskell Script |
| .lib | Data | Generic Data Library |
| .library-ms | System | Windows Library Description File |
| .lic | Misc | Software License File |
| .licenses | Developer | Visual Studio Licensed Classes File |
| .licx | Developer | Visual Studio License File |
| .lid | Misc | Kodak EasyShare Album File |
| .lif | Data | TurboTax Information Archive |
| .lif | Raster Image | Leica Image File |
| .lily | Settings | PCSX2 LilyPad Configuration File |
| .lin | CAD | AutoCAD Linetype File |
| .link | Misc | iPod Link File |
| .linx | Misc | iPod Links Folder |
| .lip | Game | Real Virtuality Lip Sync File |
| .lip | Game | Bethesda Softworks Lip Sync File |
| .lis | Developer | VAX Program Listing |
| .lis | Text | SQR Output File |
| .lisp | Developer | Lisp Source Code File |
| .list | Developer | JAR Index File |
| .lit | Developer | Literate Haskell Script |
| .lit | Text | eBook File |
| .livereg | Data | Symantec Antivirus Session File |
| .liveupdate | Data | Symantec LiveUpdate File |
| .lix | Data | Logos Library System File |
| .lix | Data | ExtendSim Simulation Software Library |
| .ljp | Raster Image | Lossless JPEG Image |
| .ll | Game | List & Label Preview File |
| .llb | Data | LabVIEW Library File |
| .llm | 3D Image | Linden Lab Mesh File |
| .llx | Backup | LabVIEW VI Library Backup File |
| .lms | Data | LenMus Score File |
| .lmu | Game | RPG Maker Map File |
| .lmx | Data | Landmark Exchange File |
| .lnd | 3D Image | 3D Landscape File |
| .lng | Plugin | Acrobat Language Plug-in |
| .lng | Data | AVG Language File |
| .lng | Data | Application Language Support File |
| .lng | Data | MAME Language File |
| .lng | Plugin | Winamp Language File |
| .lnk | System | File Shortcut |
| .lnst | Settings | Adobe InDesign Line Presets File |
| .lnt | Developer | PC-lint/FlexeLint Configuration File |
| .lnt | Data | LiveNote Case File |
| .lnt | Text | Laego Note Taker File |
| .lnx | Compressed | Commodore 64 Lynx Archive |
| .lnx | Disk Image | Atari Lynx ROM |
| .lo | Executable | Interleaf Compiled Lisp File |
| .loaders | Settings | GTK+ Loaders File |
| .loc | Data | GPS Location File |
| .localstorage | Data | Chrome Local Storage Data File |
| .lock | Misc | Lock File |
| .lock | Game | Minecraft World Lock File |
| .lockfile | System | Mac OS X PLIST Lock File |
| .lod | Game | Heroes of Might and Magic 3 Graphics File |
| .lof | Audio | Audacity File List |
| .log | Data | AntiVir Report Log File |
| .log | Text | Log File |
| .log1 | System | Windows Registry Hive Log File |
| .log2 | System | Windows Registry Hive Log 2 File |
| .logonvista | Misc | LogonStudio Windows Vista Logon Screen |
| .logonxp | Misc | LogonStudio Windows XP Logon Screen |
| .lol | Developer | LOLCODE Source Code FIle |
| .loov | Misc | Smadav Virus Definitions File |
| .lop | Settings | Mastercook Layout File |
| .love | Game | LÖVE Game File |
| .lp2 | Text | iLEAP Word Processing Document |
| .lp7 | Data | LP7 Digitally Signed File |
| .lpd | System | Lookout Protocol Driver File |
| .lpd | System | LPD Daemon Print Permissions File |
| .lpdb | Data | Librarian Pro Database File |
| .lpk | Data | Tecplot Layout Package |
| .lpk | GIS | ArcGIS Layer Package |
| .lproj | Developer | Localized Project Folder |
| .lps | 3D Image | Bryce Leaf Shape File |
| .lqr | Compressed | SQ Compressed LBR Archive |
| .lqt | Audio | Liquid Audio File |
| .lrc | Misc | Lyrics File |
| .lrcat | Data | Adobe Photoshop Lightroom Catalog File |
| .lrdata | Data | Adobe Photoshop Lightroom Data File |
| .lrdb | Developer | Photoshop Lightroom Database |
| .lrec | Video | Inter-Tel Web Conference Recording |
| .lrf | Developer | Microsoft Linker Response File |
| .lrf | Data | Sony Portable Reader File |
| .lrs | Data | Librie Reader Source File |
| .lrtemplate | Settings | Adobe Photoshop Lightroom Template |
| .lrx | Data | Sony Portable Reader File |
| .ls | Executable | LightWave LScript File |
| .ls3 | Data | Band-in-a-Box Third-Party Styles File |
| .lsd | Game | RPG Maker Game Save File |
| .lsf | Data | Logos Library System File |
| .lsf | Video | Streaming Media Format |
| .lsl | Data | LightScribe Label |
| .lso | Audio | Logic Audio Project |
| .lsp | Data | LANsurveyor Poll List |
| .lsp | Developer | Lisp Program Source Code File |
| .lsr | Data | LANsurveyor Report |
| .lst | Text | FoxPro Documenting Wizard List |
| .lst | Text | Data List |
| .lst | System | GRUB Boot List File |
| .lst | Data | LightScribe Label Template |
| .lsu | Data | LANsurveyor Map |
| .lsw | Game | RPG Maker Saved Game File |
| .lsx | Video | Streaming Media Shortcut |
| .lt2 | 3D Image | Poser Light Set File |
| .ltf | Misc | Frogans Shortcut File |
| .ltr | Text | Letter File |
| .ltx | Text | LaTeX Document |
| .ltx | Game | S.T.A.L.K.E.R. Properties File |
| .ltz | 3D Image | Compressed Poser Light Set File |
| .lua | Developer | Lua Source File |
| .lue | Text | Norton LiveUpdate Log File |
| .luf | Text | Lipikar Uniform Format File |
| .luxb | Game | Lux Map File |
| .lva | Settings | Logitech Video Effects Avatar File |
| .lvf | Settings | Logitech Video Effects File |
| .lvl | Game | Game Level File |
| .lvm | Data | LabVIEW Measurement File |
| .lvp | Audio | Avaya Voice Player Audio File |
| .lvw | Data | Livewire Document |
| .lw4 | Data | Lightwright 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 |
| .lxa | Misc | Microsoft Speech Lexicon File |
| .lxcp | Settings | LCARS x32 Color Profile |
| .lxf | 3D Image | LEGO Digital Designer Model File |
| .lxfml | Text | LEGO Digital Designer XML File |
| .lxsopt | Settings | Liquid XML Studio Project Options File |
| .lxsproj | Developer | Liquid XML Studio Project File |
| .ly | Data | LilyPond File |
| .lyr | Misc | ArcView Layer File |
| .lyt | Settings | vanBacsco's Karaoke Player Skin File |
| .lyt | Text | TurboTax Install Log File |
| .lyt | Settings | Xcalibur Layout File |
| .lyx | Text | LyX Document |
| .lz | Compressed | Lzip Compressed File |
| .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 |
