| File extension | Developer/Producer | File description |
|---|---|---|
| L file extension | N/A | Left Audio Channel Format |
| L01 file extension | Guidance Software | EnCase Logical Evidence Format |
| L2L file extension | IBM | IBM Voice Type Languages Addword |
| L2P file extension | IBM | BM Voice Type Languages Addword |
| L2R file extension | NCsoft Corporation | Lineage II Replay |
| L32 file extension | Softel Limited | Swift Line 21 Caption |
| L3D file extension | Lionhead Studios | Black & White Graphics Format |
| L4D file extension | MAXON Computer | Cinema 4D Layout Settings Format |
| L5K file extension | Rockwell Automation, Inc. | RSLogix 5000 |
| L6T file extension | Line 6 | Line 6 GearBox Tone Format |
| LA file extension | La | La Lossless Compressed Audio Format |
| LA0 file extension | LucasArts Entertainment Company, LLC | LucasArts Game Data |
| LA1 file extension | LucasArts Entertainment Company, LLC | LucasArts Game Data |
| LA2 file extension | LucasArts Entertainment Company, LLC | LucasArts Game Data |
| LAA file extension | N/A | LucasArts AdLib Audio |
| LAB file extension | Corel | Corel WordPerfect Label Definition Format |
| LABX file extension | LEYBOLD | CASSY Lab |
| LABY file extension | Laby | Laby Level Format |
| LACCDB file extension | Microsoft | Microsoft Access 2007/2010 Database Lock Format |
| LAD file extension | Daylon Graphics Ltd. | Daylon Leveller Animation Data |
| LAE file extension | IBM | Local Authentication Export |
| LAF file extension | Lingoes Project | Lingoes Appendix |
| LAI file extension | GNU Project | GNU Libtool Temporary |
| LAK file extension | SUGIMOTO Tomohiko | Kashmir |
| LAM file extension | N/A | Netscape Media Player Streaming Audio Metafile |
| LAMP file extension | Graphisoft | ArchiCAD For MAC Geometric Description Language |
| LAN file extension | ERDAS | Erdas LAN Image Format |
| LANALYSER file extension | Novell, Inc. | Novell Netware LANalyzer Trace |
| LAND file extension | UserLand Software, Inc. | Userland Frontier |
| LANG file extension | Skype | Skype Language Settings Format |
| LAO file extension | Seiko Epson Corporation | EPSON SMART PANEL |
| LAR file extension | Geneva Media, LLC | Liquid Audio Player Registration |
| LAS file extension | ASPRS | LIDAR Data Exchange Format |
| LASSO file extension | LassoSoft | Lasso Database Driven Web Page |
| LASTBUILDSTATE file extension | Microsoft Corporation | MSBuild Exported Build |
| LASTLOGIN file extension | N/A | Minecraft User Settings Format |
| LAT file extension | LaTeX Project Development Team | LaTeX |
| LATEX file extension | N/A | Latex Text Document Format |
| LAUNCH file extension | Zend Technologies Ltd. | Zend Studio Debugger Configuration |
| LAUNCHEREX_SOURCERECORD file extension | Google Inc. | Foston Google Android |
| LAV file extension | Geneva Media, LLC | Liquid Audio Player Voucher |
| LAVS file extension | N/A | Liquid Audio Secured Download |
| LAX file extension | Anet | AnetHelpTool JavaHelp Viewer |
| LAY file extension | Apple | Apple DVD Studio Pro Layout Format |
| LAYERDIAGRAM file extension | Microsoft Corporation | Microsoft Visual Studio Layer Diagram |
| LAYOUT file extension | Code Blocks | Code::Blocks Workspace Layout Format |
| LAYOUTDESIGNER file extension | Intuit Inc. | QuickBooks Layout Designer Template |
| LB file extension | Procedimientos-Uno, S.L. | LBwin Project |
| LBA file extension | Shoptalk Systems | Liberty BASIC |
| LBC file extension | Curry K. Software | Cloaked Affiliate Link Builder Saved Link Format |
| LBD file extension | Llamagraphics | Life Balance User Data |
| LBE file extension | Llamagraphics | Life Balance Xml-based Data Exchange |
| LBF file extension | 2K Games | Bioshock 2 Configuration |
| LBG file extension | dataBased Intelligence, Inc. | DBASE IV Label Generator Data |
| LBI file extension | Adobe Systems | Adobe Dreamweaver Library Format |
| LBK file extension | General Electric Company | VersaPro Local Logic Block Backup |
| LBL file extension | Euro Plus | NiceLabel Template Format |
| LBM file extension | Electronic Arts | Deluxe Paint Bitmap Image |
| LBO file extension | dataBased Intelligence, Inc. | DBASE IV Compiled Label |
| LBP file extension | Schneider Electric S.A. | ProWORX Nxt Logic Pointer |
| LBR file extension | N/A | EAGLE Library Format |
| LBS file extension | Raining Data | Omnis Studio Application Format |
| LBT file extension | N/A | Visual FoxPro Additional Label Description Format |
| LBU file extension | Curry K. Software | Cloaked Affiliate Link Builder Settings Format |
| LBX file extension | Microsoft | Visual FoxPro Main (DBF) Label Description Format |
| LBXCOL file extension | N/A | Libronix DLS Resource Collection |
| LBXDTP file extension | Libronix Corporation | Libronix DLS Data Type |
| LBXLLS file extension | Logos Research Systems, Inc. | Logos Libronix 3.0 |
| LBXOEB file extension | Logos Research Systems, Inc. | Libronix DLS Resource |
| LCB file extension | Radium Technologies | Living Cookbook Format |
| LCC file extension | Phase One | Capture One PRO Format |
| LCD file extension | Space International | CDSpace Disk Image |
| LCF file extension | Graphisoft | ArchiCAD Library Container Format |
| LCH file extension | N/A | IBM Works For OS/2 Chart |
| LCI file extension | IBM | IBM Voice Type Languages Newuser |
| LCK file extension | N/A | Lock Format |
| LCL file extension | N/A | Localization |
| LCLW file extension | Apple, Inc. | ClarisWorks Art Library |
| LCM file extension | Lipikar | Lipikar Custom Map Format |
| LCN file extension | Trymedia Systems, Inc. | License Format |
| LCP file extension | FireModels.org | FARSITE Landscape Data |
| LCS file extension | The Sage Group plc | ACT! History |
| LCT file extension | James L. Tonne | Electrical Filter Design |
| LCX file extension | Cray Inc. | LC Model |
| LD file extension | deltaComm Development, Inc. | Telix Long Distance Codes |
| LD1 file extension | dataBased Intelligence, Inc. | DBASE Overlay |
| LD2 file extension | Lingoes Project | Lingoes Compiled Dictionary Format |
| LD4 file extension | The World Management Pte Ltd. | ACCPAC Plus Menu |
| LDA file extension | N/A | LaserData Image Format |
| LDB file extension | Microsoft | Microsoft Access Record-Locking Information Format |
| LDD file extension | LEGO Group | LEGO Digital Designer |
| LDF file extension | Microsoft | Microsoft SQL Server Log Format |
| LDI file extension | N/A | LDIF Address Book Interchange Format |
| LDIF file extension | N/A | LDIF Address Book Interchange Format |
| LDL file extension | Corel Corporation | Corel Paradox Delivered Library |
| LDM file extension | Visualization Sciences Group | VolumeViz Multi-resolution Volume Format |
| LDMT file extension | Likno Software Inc. | Likno Drop-Down Menu Trees |
| LDO file extension | NovaLogic, Inc. | Nova Logic Game Loadout Text |
| LDP file extension | CAM Development | Label Designer Plus DELUXE Data |
| LDR file extension | LDraw.org | LDraw Model Format |
| LDS file extension | N/A | Linux Compile Time Header Format |
| LDT file extension | DIAL | ZENAX Source EULUMDAT Format |
| LDW file extension | LDW Software | Virtual Villagers Save Game Format |
| LDX file extension | global heavy industries | Liquid Studio Liquid Executable Bytecode |
| LDZ file extension | Microsoft Corporation | Microsoft Visual Studio DSM Project |
| LE file extension | Apple, Inc. | Le Mac OS X |
| LED file extension | N/A | Sony AIBO AIBO LED File Format |
| LEF file extension | N/A | LEN Exchange Format |
| LEG file extension | Davis Creek Elementary School | LEGOCAD |
| LEGAL file extension | DaveTech | DaveTech Legal Document |
| LEI file extension | N/A | Leica SP1 Image Session |
| LEMON file extension | LemonShare.net | LemonShare.net Download Format |
| LENS file extension | Autodesk, Inc. | Autodesk Stitcher Camera Profile |
| LEP file extension | CAM Development | Label And Envelope Designer Plus 2000 |
| LESS file extension | Alexis Sellier | LESS Style Sheet Format |
| LET file extension | AmericanGreetings.com | Creatacard Letterhead Project |
| LETTER file extension | N/A | Undeliverable Mail Format |
| LEV file extension | SINTEF | CARE-S InfoWorks Level |
| LEX file extension | Adobe Systems | Adobe Linguistic Library Data Format |
| LF file extension | SoftwareKey | SoftwareKey License |
| LFA file extension | Credo Interactive Inc. | Life Forms |
| LFE file extension | Laserfiche | LFClient Document |
| LFF file extension | N/A | LucasFilm Format Image Format |
| LFM file extension | Credo Interactive Inc. | LifeForm Format |
| LFO file extension | Camel Audio | Camel Audio Alchemy Preset Format |
| LFP file extension | IPRO Tech | IPRO View Database Format |
| LFS file extension | Samsung | Samsung Test Picture Image Format |
| LFT file extension | Cay Horstmann | ChiWriter Laser Printer Font |
| LG0 file extension | IBM | IBM Tivoli Monitoring Log |
| LG1 file extension | IBM | IBM Tivoli Monitoring Log Backup |
| LG2 file extension | DCC Corporation | HotMux Thermocouple Data Log |
| LGA file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGB file extension | Intuit Inc. | QuickBooks Little Green Box |
| LGC file extension | Prosystech | SimpleK Database Format |
| LGD file extension | Microsoft Corporation | Windows Application Log |
| LGF file extension | Palmer Performance | PMSCAN Log Format |
| LGG file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGH file extension | N/A | HMI Historical Log Format |
| LGI file extension | Softronics | Multimedia Logic Format |
| LGJ file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGK file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGL file extension | LeechGet | LeechGet Download Queue Format |
| LGM file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGN file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGO file extension | Softronics | Logo Instructions Format |
| LGP file extension | Square Enix | Final Fantasy Game Archive Format |
| LGQ file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGR file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGS file extension | Microsoft Corporation | Microsoft Windows Application Log |
| LGT file extension | Let's Go! | Lets Go! Theme Format |
| LGV file extension | Microsoft Corporation | Debugging Tools For Windows Logger Log |
| LGW file extension | ANSYS Inc. | Ansys |
| LGZ file extension | Microsoft Corporation | Windows Application Log |
| LHA file extension | N/A | LH ARC Compressed Archive |
| LHARC file extension | Ivan Zahariev | LH ARC Compressed Archive |
| LHR file extension | Intuit | Quicken Financial Life For Mac Financial Data Format |
| LHS file extension | N/A | Literate Haskell Programming Language Source Code Format |
| LHW file extension | Jonathan Forbes | LHWarp Compressed Amiga Archive |
| LHX file extension | GridSense | LineTracker Firmware Upgrade |
| LHZ file extension | N/A | LHA Compressed File Archive |
| LI3D file extension | BeLight Software | BeLight Live Interior 3D Design Format |
| LIA file extension | Altium Limited. | P-CAD Schematics Library |
| LIB file extension | N/A | Microsoft Linker Input Library Format |
| LIB4D file extension | MAXON Computer GmbH | Cinema 4D Library |
| LIBRARY file extension | Dassault Systèmes S.A. | CATIA Library |
| LIBRARY-MS file extension | Microsoft | Microsoft Windows 7 Library Description Format |
| LIC file extension | N/A | License Format |
| LICENSEKEY file extension | Coriolis Systems | Coriolis IPartition License Information Format |
| LICENSES file extension | Microsoft | Microsoft Visual Studio Licensed Classes Format |
| LICKEY file extension | Online Media Technologies Ltd. | AVS4YOU License Key |
| LICRYPT file extension | N/A | Encrypted |
| LICX file extension | Microsoft | Microsoft Visual Studio License Format |
| LID file extension | Kodak | Kodak EasyShare Album Format |
| LIF file extension | N/A | TurboTax Information Archive Format |
| LIFE file extension | Light of Creativity | LIGHT Format |
| LIG file extension | Teldas GmbH | INet-Server |
| LIGHTWAVE file extension | NewTek, Inc. | Lightwave 3D Layered Object |
| LIK file extension | N/A | Trojan.Win32.Agent.lik |
| LILY file extension | The PCSX2 Team | PCSX2 LilyPad Configuration Format |
| LIN file extension | Autodesk | AutoCAD Linetype Definition |
| LINK file extension | N/A | Apple IPod Link Format |
| LINUX file extension | Various Linux developers | Linux |
| LINX file extension | N/A | Apple IPod Links Folder Format |
| LIP file extension | Bethesda Softworks | Bethesda Softworks Lip Sync Format |
| LIQUID file extension | N/A | Shopify Liquid Template |
| LIR file extension | Applied Digital | ADI Ocelot Settings |
| LIS file extension | N/A | VAX Program Listing |
| LISP file extension | N/A | LISP Translators Format |
| LIST file extension | Oracle | JAR Index Format |
| LIT file extension | Microsoft | Microsoft Reader EBook Format |
| LITEMOD file extension | Mumfrey | Minecraft Mod |
| LITTLE file extension | Mozilla Corporation | Mozilla Firefox Start-up Cache |
| LIV file extension | Cantoche | Living Actor Actor |
| LIVEREG file extension | Symantec | Symantec Livereg Antivirus Session Format |
| LIVESUBSCRIBE file extension | N/A | Symantec Antivirus Update Catalog |
| LIVEUPDATE file extension | Symantec | Symantec Liveupdate Format |
| LIX file extension | N/A | Logos Library System Format |
| LIZD file extension | BeLight Software | BeLight Live Interior 3D Compressed Design Format |
| LJP file extension | Joint Photographic Experts Group | Lossless JPEG Bitmap Image Format |
| LK# file extension | Autodesk, Inc. | Autodesk Multi-user Coordination Lock |
| LKG file extension | Hewlett-Packard Company | HP-UX Configuration |
| LKH file extension | N/A | Worm.Generic.LKH Virus |
| LKO file extension | Microsoft Corporation | Microsoft Outlook Express |
| LKR file extension | Microchip Technology Inc. | MPLAB Linker |
| LL file extension | Combit | List & Label Preview Format |
| LLB file extension | National Instruments | LabVIEW Application Program Library Format |
| LLC file extension | Laplink Software | LapLink Saved Connection |
| LLM file extension | Linden Research | Linden Lab Mesh Format |
| LLP file extension | General Electric Company | VersaPro Local Logic Block |
| LLS file extension | Microsoft Corporation | Windows System |
| LLT file extension | Liquidity Lighthouse | Liquidity Lighthouse Transaction Format |
| LLV file extension | LockLizard Limited | Lizard Safeguard License |
| LLX file extension | National Instruments | LabVIEW Library Backup Format |
| LM4 file extension | N/A | Steinberg VST Sample |
| LMA file extension | Hot Lava Software | Learning Mobile Author (LMA) Project |
| LMBS file extension | Adobe Systems Incorporated | Adobe Photoshop For Mac Filter |
| LMD file extension | ABBYY | Abbyy Finereader Sprint |
| LMF file extension | Cadence Design Systems, Inc. | Library Mapping And Altera Data Interchange |
| LMG file extension | CRYTEK | CryENGINE Locomotion Group Animation |
| LMH file extension | L.Spiro | Memory Hacking Software Memory |
| LMK file extension | SourceTec Software | Sothink Logo Maker Logo Format |
| LMLPACK file extension | SUGIMOTO Tomohiko | Kashmir 3D Link |
| LMP file extension | id Software LLC | Doom Recorded Demo |
| LMR file extension | Intuit Inc. | QuickBooks Loan Manager Data |
| LMS file extension | LenMus | LenMus Score Format |
| LMT file extension | Enterbrain, Inc. | RPG Maker 2000/2003 Map Tree |
| LMU file extension | Enterbrain | RPG Maker Map Format |
| LMV file extension | Adobe Systems Incorporated | Adobe Flash Source Code |
| LMX file extension | Nokia | Nokia Landmark Exchange Format |
| LN file extension | IBM | UNIX Lint |
| LNA file extension | Xilinx, Inc. | Xilinx ISE |
| LNC file extension | Sports Interactive | Football Manager Player |
| LND file extension | Upperspace | 3D Landscape Data |
| LNF file extension | Philippe Blanc | Oyoaha Lookandfeel Interface Elements |
| LNG file extension | N/A | Language Definition Format |
| LNGX file extension | Dominik Reichl | KeePaas Language |
| LNK file extension | Microsoft | Windows Shortcut Format |
| LNM file extension | Corel Corporation | Corel WordPerfect SGML Alias |
| LNP file extension | ARM Holdings plc | µVision Linker Input Format |
| LNS file extension | AVG Technologies (Grisoft) | AVG Anti-Virus Language |
| LNST file extension | Adobe Systems | Adobe InDesign Format |
| LNT file extension | Gimpel Software | PC-lint Configuration Format |
| LNX file extension | N/A | Atari Lynx ROM Image Format |
| LNZ file extension | Ubisoft Entertainment S.A. | Petz Linez |
| LO file extension | BroadVision | Interleaf Compiled Lisp Format |
| LOADERBACKUP file extension | BlackBerry (Research In Motion Limited) | BlackBerry Backup |
| LOADERS file extension | N/A | GTK+ Loaders Format |
| LOADTEST file extension | Microsoft Corporation | Microsoft Visual Studio Load Test |
| LOB file extension | IBM | IBM DB2 LOBFILE |
| LOC file extension | N/A | Localisation String Resource Header Format |
| LOCAL file extension | Embarcadero Technologies, Inc. | Delphi User-specific Project Options |
| LOCALIZED file extension | Apple, Inc. | MAC OS X |
| LOCALSTORAGE file extension | The WebKit Open Source Project | WebKit Local Storage Data Format |
| LOCALSTORAGE-JOURNAL file extension | Google Inc. | Google Chrome Rollback Journal |
| LOCK file extension | N/A | Lock Format |
| LOCK3 file extension | BlackBerry (Research In Motion Limited) | BlackBerry Encrypted 3GP |
| LOCKFILE file extension | Apple | Mac OS X Lion Property List XML Lock Format |
| LOCK_SYNC file extension | Apple, Inc. | Synchronization Lock |
| LOD file extension | Ubisoft | Heroes Of Might And Magic 3 Graphics Format |
| LOF file extension | Audacity | Audacity File List |
| LOG file extension | N/A | Log Format |
| LOG1 file extension | Microsoft | Microsoft Windows Registry Hive Log Format |
| LOG2 file extension | Microsoft | Microsoft Windows Registry Hive Log 2 Format |
| LOGIC file extension | Apple | Apple Logic Pro Music Project Format |
| LOGIKCS file extension | Apple, Inc. | Apple Logic Key Commands |
| LOGIN file extension | The Open Group | UNIX Command |
| LOGONVISTA file extension | Stardock | Stardock LogonStudio Windows Vista Logon Screen Format |
| LOGONXP file extension | Stardock | LogonStudio Document Format |
| LOK file extension | Nuance Communications, Inc. | OmniPage 9 |
| LOL file extension | Adam Lindsay | Lolcode Source Format |
| LOLS file extension | N/A | LOLCODE Source Code |
| LON file extension | CGS plus | Aquaterra Profile Data |
| LOOK file extension | Adobe Systems | SpeedGrade Look Format |
| LOOP file extension | Apple, Inc. | Apple Soundtrack Pro |
| LOOV file extension | Smadsoft | Smadav Virus Definitions Format |
| LOP file extension | ValuSoft | MasterCook Layout Format |
| LOS file extension | Atomic Games, Inc. | Close Combat 2 Map Related |
| LOT file extension | LaTeX Project Development Team | LaTex Auxiliary File For List Of Tables |
| LOV file extension | SAP AG | SAP Business Objects |
| LOVE file extension | LÖVE | LÖVE Game Package Format |
| LO_ file extension | Microsoft Corporation | Microsoft System Management Server Renamed Old Log |
| LP file extension | Autodesk | Lightscape 3D Object Format |
| LP2 file extension | C-DAC | ILEAP Word Processor Document Format |
| LP4 file extension | UIC Phoenxsoftware | 36-Image Converter Encrypted Language Pack |
| LP7 file extension | Lex Persona | LP7Signer Digital Signed Format |
| LPA file extension | MP Filtri UK Ltd | LPA View Laser Particle Analyser |
| LPAQ8 file extension | N/A | PAQ Data Archive |
| LPB file extension | JEK Software | LaserTank Game Replay Format |
| LPD file extension | National Instruments | Lookout Protocol Driver Format |
| LPDB file extension | Koingo Software | Librarian Pro Database Format |
| LPDF file extension | Apple | Mac OS X Localized PDF (Portable Document Format) Format |
| LPF file extension | Orgadata AG | Orgadata LogiKal |
| LPI file extension | http://www.lazarus.freepascal.org/ | Free Pascal Lazarus Project Information |
| LPK file extension | ESRI | ArcGIS Layer Package Format |
| LPMD file extension | LPMD | Las Palmeras Molecular Dynamics (LPMD) Data Format |
| LPN file extension | SYSTEMS EUROPE sa/nv | LVPLAN |
| LPP file extension | CyberLink | LabelPrint Project Format |
| LPR file extension | Relic Entertainment Inc. | Homeworld |
| LPROJ file extension | N/A | Mac OS X Localized Project Folder Format |
| LPS file extension | DAZ Productions | Bryce Leaf Shape Format |
| LPT file extension | N/A | LogPlot Compiled Boring Log |
| LPU file extension | SDL | Passolo Localization Project |
| LPW file extension | IRIS | IRIS Laserform Lforms |
| LPX file extension | Nick Van Beurden | LaTeXPiX Script |
| LQF file extension | Jan Debis | LeechFTP Save Queue |
| LQR file extension | N/A | SQ Compressed LBR Archive |
| LQT file extension | Liquid Digital Media | Liquid Audio Liquid Digital Media Music File Format |
| LR file extension | Adtollo | Chaos Desktop Layer List |
| LRC file extension | N/A | Lyric Format |
| LRCAT file extension | Adobe Systems | Adobe Lightroom Catalog Format |
| LRCAT-JOURNAL file extension | Adobe Systems Incorporated | Adobe Photoshop Lightroom |
| LRD file extension | Microsoft Corporation | Microsoft Money Lock |
| LRDATA file extension | Adobe Systems | Adobe Lightroom Preview Data |
| LRDB file extension | Adobe Systems | Photoshop Lightroom Database |
| LREC file extension | Inter-Tel | Inter-Tel Web Conference Recording Format |
| LRF file extension | Sony | BBeB Ebook Format |
| LRG file extension | N/A | Macromedia XRes Multi-resolution Bitmap |
| LRL file extension | SmartWare Corporation | SmartWare Local Resource Library |
| LRM file extension | Microsoft Corporation | Microsoft Encarta Class Server Learning Resource |
| LRN file extension | Apple, Inc. | Apple Chess User Data |
| LRP file extension | IBM | IBM Works For OS/2 Report |
| LRPLUGIN file extension | Adobe Systems | Adobe Photoshop Lightroom Plug-in Format |
| LRPREV file extension | Adobe Systems Incorporated | Adobe Photoshop Lightroom Index |
| LRS file extension | N/A | BBeB Ebook Source Format |
| LRSMCOL file extension | Adobe Systems | Adobe Photoshop Lightroom Settings Format |
| LRTEMPLATE file extension | Adobe Systems | Adobe Photoshop Lightroom Preset Settings Format |
| LRTOOLKIT file extension | Adobe Systems Incorporated | Adobe Photoshop Lightroom |
| LRV file extension | GoPro | Low Resolution Video Format |
| LRWEBENGINE file extension | Adobe Systems | Lightroom Folder |
| LRX file extension | Sony | BBeB Ebook Format |
| LRY file extension | Konica Minolta Holdings, Inc. | Konica Minolta Data Management Software Reference Data |
| LS file extension | NewTek | LightWave LScript Format |
| LS1 file extension | Microsoft Corporation | Microsoft Winhelp Source |
| LS3 file extension | PG Music | Band-in-a-Box Style Format |
| LS4 file extension | Act-3D | Lumion Exported Full Scene |
| LSA file extension | N/A | Lotus Designer Agent |
| LSAPROTOTYPE file extension | Microsoft Corporation | Microsoft Visual Studio Logical Datacenter Diagram Toolbox Prototype |
| LSC file extension | Siemens AG | LOGO! Soft Comfort |
| LSD file extension | Enterbrain | RPG Maker Saved Game Format |
| LSF file extension | N/A | Logos Library System Format |
| LSL file extension | Hewlett-Packard | LightScribe Template Labeler Label Format |
| LSLIBRARY file extension | Realmac Software Limited | Littlesnapper User Library Package |
| LSM file extension | Carl Zeiss AG | Ziess LSM Model |
| LSN file extension | MakeMusic | Finale Lesson Format |
| LSO file extension | N/A | Apple Logic Song Format |
| LSP file extension | N/A | LANsurveyor Poll List Format |
| LSPROJ file extension | Microsoft | Visual Studio LightSwitch Project |
| LSQ file extension | IBM | IBM Voice Type Languages Addword |
| LSR file extension | N/A | LANsurveyor Report Format |
| LSS file extension | N/A | Legato Spreadsheet |
| LST file extension | N/A | List Text Format |
| LSTX file extension | Rick Meyers | E-Sword Verse List |
| LSU file extension | N/A | LANsurveyor Map Format |
| LSV file extension | Light-O-Rama | Light-O-Rama Sequence Editor Visual Preference |
| LSW file extension | Enterbrain | RPG Maker Saved Game Format |
| LSX file extension | Microsoft | Advanced Streaming Redirector Format |
| LSZ file extension | Tribal | Learning Score Zip |
| LS_ file extension | The Open Group | Unix Ls Directory |
| LT2 file extension | Smith Micro | Poser Light Set Format |
| LTA file extension | Monolith Productions, Inc. | Monolith Lithtech Game Engine |
| LTB file extension | Amma Software | Amma Little Setup Builder |
| LTC file extension | Ulrik Sandborg-Petersen | LTC Syntactically Analyzed Text |
| LTCX file extension | Ulrik Sandborg-Petersen | LTC Syntactically Analyzed Text XML |
| LTD file extension | Lifescope, Inc. | LivingTime Data |
| LTF file extension | STG Interactive | Frogans Short-cut Format |
| LTG file extension | JEK Software | LaserTank Graphics Format |
| LTH file extension | Roxio | Roxio Label Creator Style |
| LTKEY file extension | Almeza Company | LeaderTask Key |
| LTL file extension | DIAL GMBH | DIALux Luminaire Data |
| LTM file extension | IBM | IBM Lotus Forms Form |
| LTS file extension | Microsoft Studios | Links Email Tourney |
| LTT file extension | N/A | HP Library And Tape Tools Log |
| LTX file extension | N/A | LaTeX Document |
| LTZ file extension | Smith Micro | Poser Compressed Light Set Format |
| LUA file extension | N/A | Lua Script Format |
| LUAC file extension | N/A | Lua Compiled Source Code |
| LUAR file extension | UltraDefrag Development Team | UltraDefrag Lua Report |
| LUCA file extension | N/A | Luca Template |
| LUCS file extension | W3C | Amaya Tools |
| LUD file extension | SINTEF | CARE-S InfoWorks Land Use |
| LUE file extension | Symantec | Norton LiveUpdate Log Format |
| LUF file extension | Lipikar | Lipikar Uniform Format |
| LUG file extension | N/A | Game |
| LUM file extension | Kevin Chong | Luminous Song List |
| LUT file extension | Lutron Electronics | RadioRA Database Format |
| LUTX file extension | Lutron Electronics | RadioRA Essentials Database Format |
| LUV file extension | Sega Corporation | Medieval 2 Total War |
| LUXB file extension | Sillysoft | Lux Delux Map Format |
| LUZ file extension | Coloritto BV | Spectramap |
| LV6 file extension | Midnight Synergy | Return To Wonderland Level |
| LVA file extension | Logitech | Logitech Video Effects Avatar Format |
| LVB file extension | LucasArts Entertainment Company, LLC | Outlaws Game |
| LVCLASS file extension | National Instruments Corporation | LabVIEW Class Library |
| LVD file extension | Avery Dennison Corporation | LabelPro Design Document |
| LVF file extension | Logitech | Logitech Video Effects Avatar And Face Accessory |
| LVIVT file extension | Lvivtotoro | Lvivtotoro Game Format |
| LVIX file extension | EditShare | Lightworks Video Index |
| LVL file extension | N/A | Game Level Format |
| LVLIB file extension | National Instruments Corporation | LabVIEW Project Library |
| LVLIBP file extension | National Instruments Corporation | LabVIEW Packed Project Library |
| LVLPS file extension | National Instruments Corporation | LabVIEW Local Project Settings |
| LVM file extension | National Instruments | LabVIEW Measurement Format |
| LVP file extension | Avaya | Avaya Voice Player Compressed Voice Audio |
| LVR file extension | Microsoft Corporation | Microsoft Visual Studio Environment Snapshot |
| LVW file extension | New Wave Concepts | Livewire Document Format |
| LW file extension | NewTek, Inc. | LightWave 3D Binary |
| LW2 file extension | John McKernon Software | Lightwright Show Data |
| LW3 file extension | John McKernon Software | Lightwright Data |
| LW4 file extension | John McKernon Software | Lightwright 4 Show Data Format |
| LW5 file extension | John McKernon Software | Lightwright Show Data |
| LWA file extension | John McKernon Software | Lightwright Automated Action |
| LWAC file extension | Likno Software Inc. | Likno Web Accordion Builder |
| LWBM file extension | Likno Software Inc. | Likno Web Button Maker |
| LWC file extension | Millennia Corporation | Legacy Charting Chart |
| LWD file extension | N/A | LotusWorks Text Document |
| LWF file extension | N/A | LuraWave Format Image Format |
| LWFN file extension | Adobe Systems | Adobe Type 1 Font |
| LWI file extension | N/A | Light Work Image Image Format |
| LWK file extension | Siemens Product Lifecycle Management Software Inc. | Siemens NX Software Graphics |
| LWL file extension | John McKernon Software | Lightwright Printed Paperwork Formatting Instructions |
| LWLO file extension | NewTek, Inc. | LightWave Layered Object |
| LWM file extension | Harald-René Flasch | LittleWays Map |
| LWMW file extension | Likno Software Inc. | Likno Web Modal Windows Builder |
| LWO file extension | NewTek | LightWave Object Format |
| LWOB file extension | NewTek, Inc. | LightWave 3D Object |
| LWP file extension | IBM | Lotus Word Pro Document Format |
| LWPP file extension | SquidMelon | Live Wallpaper For Mac Desktop Theme |
| LWQ file extension | Grassland, Soil & Water Research Laboratory | SWAT Lake Water Quality Input |
| LWS file extension | NewTek | LightWave Scene Format |
| LWT file extension | John McKernon Software | Lightwright Attribute List |
| LWTB file extension | Likno Software Inc. | Likno Web Tabs Builder |
| LWTP file extension | LimeWire | LimeWire Theme Format |
| LWTT file extension | Likno Software Inc. | Likno Web Tooltips Builder |
| LWV file extension | Microsoft | Microsoft Linguistically Enhanced Sound Format |
| LWX file extension | John McKernon Software | Lightwright Database |
| LWZ file extension | NewTek, Inc. | LightWave 3D Plugin |
| LXA file extension | Microsoft | Microsoft Speech Engines Lexicon Format |
| LXCP file extension | LCARS x32 | LCARS X32 For Windows Color Profile Format |
| LXD file extension | PPCLINK Mobile Software | EDictionary Reader Dictionary Data |
| LXF file extension | LEGO | LEGO CAD Scene Format |
| LXFML file extension | LEGO | LEGO Digital Designer XML Format |
| LXK file extension | N/A | COREX Lexicon Link-up |
| LXL file extension | Luxology LLC. | Luxology Modo Single-layer Mesh Presets |
| LXO file extension | Luxology | Luxology Modo 302 3D Drawing Format |
| LXSOPT file extension | Liquid Technologies | Liquid XML Studio Project Settings Format |
| LXSPROJ file extension | Liquid Technologies | Liquid XML Studio Project Format |
| LXT file extension | GSC Game World | S.T.A.L.K.E.R. |
| LXV file extension | Lexar Media, Inc. | Lexar Secure II Encrypted Archive |
| LY file extension | GNU | LilyPond Music Score Format |
| LYC file extension | Stork Prints | BestIMAGE Compressed Drawing Format |
| LYR file extension | ESRI | ArcView Layer Format |
| LYS file extension | DATACAD LLC. | DataCAD Layer Control |
| LYT file extension | vanBasco Software | VanBacscos Karaoke Player Skin Format |
| LYX file extension | LyX | LyX Document Format |
| LZ file extension | Lzip | LZIP Compressed Archive Format |
| LZC file extension | Electronic Arts, Inc. | Need For Speed Undercover Game Data |
| LZF file extension | Autodesk, Inc. | Autodesk 3D Studio Max Lens Effect Flare |
| LZH file extension | N/A | LH ARC Compressed Archive Format |
| LZK file extension | BACAL software | LoizziTimeControl Database |
| LZM file extension | Slax | Slax Module Format |
| LZMA file extension | N/A | 7-Zip Compressed Format |
| LZMA86 file extension | N/A | Archive |
| LZO file extension | N/A | Lzop Archive Format |
| LZOP file extension | Markus F.X.J. Oberhumer | LZOP Compressed |
| LZP file extension | Legacy Interactive | Law And Order 3: Justice Is Served Game |
| LZS file extension | N/A | Compressed File Archive |
| LZX file extension | N/A | Amiga LZX Archive Format |
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