| Extension | Information |
| L | Cliq Accessories Datebook Lock File |
| L | LEX Program File |
| L | Link Instructions |
| L | LISP Program File |
| L | WATCOM Wlink Directive |
| L | Game of Life Pattern File |
| L | IRIS Editor Literary Format File (eurobraille) |
| L2L | IBM Voice Type Language Addword File |
| L2P | IBM Voice Type Language Addword File |
| L4D | CINEMA 4D Layout (Maxon) |
| L5K | RSLogix 5000 (Rockwell Automation) |
| L64 | 64LAN Image File |
| L95 | Library File |
| LA | Lightscape Animation |
| LA | Netscape Packetized Audio |
| LA | LA Lossless Compressed Audio |
| LA | GNU Libtool Library (GNU Project - Free Software Foundation) |
| LA1 | Liquid Audio Player Resource DLL (Geneva Media, LLC) |
| LAA | LucasArts AdLib Audio File Format |
| LAB | Mailing Labels |
| LAB | NCSS Data File |
| LAB | NCSS/SOLO Data File |
| LAB | NGSofts.com LAB Editor (NGSofts.com LAB Editor) |
| LAB | Q+E Mailing Label |
| LAB | Complete Works Label (Toplevel Computing) |
| LAB | Outlaws Container File (LucasArts Entertainment Company LLC) |
| LAD | Daylon Leveller Animation Data |
| LAF | Essential Taceo User License Activation File (Essential Security Software, Inc.) |
| LAM | Netscape Media Player Streaming Audio Metafile |
| LAN | ERDAS IMAGINE LAN Sensor Data (Leica Geosystems , LLC) |
| LAN | Novell NetWare LAN Drivers |
| LANDSAT | EOSAT Landsat Thematic Mapper Bitmap Data |
| LANG | CDex Language File |
| LANG | Skype Language File (Skype Technologies S.A.) |
| LAO | EPSON Smart Panel File |
| LAR | Liquid Audio Player Registration File (Geneva Media, LLC) |
| LASSO | Lasso Studio Database Driven Web Page (Blue World Communications, Inc.) |
| LAT | Crossword Express Lattice File (AUS-PC-SOFT) |
| LAT | LATEX |
| LATEX | LaTeX Source Document (LaTeX3 Project) |
| LAV | Liquid Audio Player Voucher File (Geneva Media, LLC) |
| LAV | Listlabl File |
| LAVS | Liquid Audio Player Secure Streaming Voucher File (Geneva Media, LLC) |
| LAW | eLawForms Form File (E*Law Publishing Limited) |
| LAY | Applause Word Chart Layout |
| LAY | Lightscape Layer State |
| LAY | MiTek Engineering File |
| LAY | Rhino 3D Layer Text File (Robert McNeel & Associates) |
| LAY | Mastercook Layout File (Sierra) |
| LAY | Track Builder Simulation Compiler Code (Signal Computer Consultants) |
| LAY | Pro/ENGINEER (PTC) |
| LAYOUT | Premiere Layout (Adobe Systems Inc.) |
| LAYUP | MSC.Patran Laminate Modeler Composites Ply Layup Information (MSC.Software Corporation) |
| LA_ | TI Databook File |
| LB | Novanew File |
| LB | LB Packer Sound File |
| LBA | Liberty BASIC File |
| LBA | Little Billy's Album Photo Album Project File (Little Billy's Album, Inc.) |
| LBD | Grafic FLI File |
| LBD | Life Balance User Data (Llamagraphics, Inc.) |
| LBE | Life Balance XML-based Data Exchange (Llamagraphics, Inc.) |
| LBG | dBASE IV Label Generator |
| LBI | Dreamweaver Library File |
| LBI | Fifa 2001 Data Feart Legal Screeen |
| LBK | VersaPro Local Logic Block Backup |
| LBL | British National Bibliography File |
| LBL | Label |
| LBL | Creatacard Label Project (Broderbund) |
| LBL | Markin Label File (Markin) |
| LBM | Deluxe Paint Bitmap |
| LBM | Deluxe Paint (Electronic Arts, Inc.) |
| LBM | Graphic, Sound |
| LBM | XLib Linear Bitmap Graphic |
| LBM | Amiga Interleaved Bitmap Format (Amiga) |
| LBO | dBASE IV Ordered Labels |
| LBR | Compressed Archive File |
| LBR | 1-2-3 Display Driver (IBM) |
| LBR | Omnis7 Application File (Omnis Software) |
| LBR | CP/M Information File |
| LBS | Omnis Studio Application Library (Raining Data Corporation) |
| LBT | Foxpro Label Memo (Microsoft) |
| LBV | Tonline Ob4hbci Layout Print File |
| LBW | CCP Log Server Utility Log File (CCP) |
| LBX | Foxpro Label (Microsoft) |
| LBXADD | Libronix DLS Addin |
| LBXALV | Logos Bible Software Series X Passage In All Versions |
| LBXCBV | Logos Bible Software Series X Copy Bible Verses Style |
| LBXCIT | Libronix DLS Citation Format |
| LBXCMP | Libronix DLS Company Information |
| LBXCOL | Libronix DLS Resource Collection |
| LBXCTB | Libronix DLS Custom Toolbar |
| LBXDAT | Libronix DLS Data File |
| LBXDTP | Libronix DLS Data Type |
| LBXGYQ | Libronix DLS Graphical Query |
| LBXLBK | Libronix DLS License Backup |
| LBXLIC | Libronix DLS Licenses File |
| LBXLLS | Libronix DLS Resource |
| LBXNOT | Libronix DLS Notes |
| LBXOEB | Libronix DLS Resource |
| LBXPDF | Libronix DLS Resource |
| LBXPLN | Logos Bible Software Series X Bible Reading Plan |
| LBXPLP | Logos Bible Software Series X Parallel Passage |
| LBXPLV | Logos Bible Software Series X Parallel Bible Versions |
| LBXPRF | Libronix DLS Preferences |
| LBXPRL | Logos Bible Software Series X Prayer List |
| LBXRAS | Libronix DLS Resource Association |
| LBXRTP | Libronix DLS Resource Type |
| LBXSDG | Logos Bible Software Series X Sentence Diagram |
| LBXSHL | Libronix DLS Shell |
| LBXUPD | Libronix DLS Update Script |
| LBXVRS | Logos Bible Software Series X Verse List |
| LBXWDL | Libronix DLS Word List |
| LBXWKS | Libronix DLS Workspace |
| LBZ | Leibniz Mathematical Word Processor |
| LC | Textbridge Classic Bin File |
| LCA | SimpleFormat Changeables Graphic |
| LCB | Living Cookbook File |
| LCB | Concept2 LogCard Utility LogCard Backup Image (Concept2, Inc.) |
| LCC | IBM Voice Type Language Newuser File |
| LCD | ABBYY Finereader 4.0 Sprint (ABBYY Software House) |
| LCD | CDspace CD Emulator |
| LCF | HP-95LX Datacomm Script File |
| LCF | Linker Control File |
| LCH | IBM Works for OS/2 Chart |
| LCH | PagePath Technologies LAUNCH! File |
| LCI | IBM Voice Type Language Newuser File |
| LCK | Frontpage-related File (Microsoft) |
| LCK | Lock File |
| LCK | PageMaker Database (Adobe) |
| LCK | Paradox Lock File (Corel) |
| LCK | ACT! Database Locking File (Best Software CRM Division) |
| LCK | Pegasus Mail Mailbox Lock File (David Harris) |
| LCK | Help 2 Lock File (Microsoft) |
| LCL | FTP Software Data |
| LCL | Checklist Long-term Checklist (Checklist à long terme) (Francis Gagné) |
| LCN | WordPerfect Dictionary File (Corel Corporation) |
| LCO | Railroad Tycoon 3 Locomotive Properties (PopTop Software Inc.) |
| LCS | ACT! History File (Best Software CRM Division) |
| LCS | L0phtCrack (@stake) |
| LCW | Lucid 3-D Spreadsheet |
| LD | Telix Long Distance Codes |
| LD | Paradox Language Driver (Corel) |
| LD | PC-Bibliothek User Options (Bibliographisches Institut & F.A. Brockhaus AG) |
| LD1 | dBASE Overlay File |
| LDA | LaserData |
| LDB | Access Lock File (Microsoft) |
| LDB | IBM Works for OS/2 Data Filer Database |
| LDB | Settler for Windows Temporary File |
| LDB | TrueVector Log Database |
| LDB | RPG Maker 2000/2003 Database (Enterbrain) |
| LDB | VisiTrax Music Library Database (Synapsa Productions) |
| LDC | Steuer2001 File |
| LDD | Laser Dispatch Data |
| LDF | Geoworks Glue Library Definition |
| LDF | IBM Works for OS/2 Data Filer Form |
| LDF | LuraDocument File |
| LDF | ProWORX Nxt Logic Data (Schneider Electric) |
| LDF | SQL Server Transaction Log File (Microsoft) |
| LDI | LDIF File |
| LDIF | LDAP Data Interchange Format |
| LDL | Corel Paradox Delivered Library |
| LDL | OzWin CompuServe E-mail/Forum Access Download Request |
| LDP | Label Designer Plus DELUXE Data File (CAM Development) |
| LDR | LDraw Model File (Estate of James Jessiman) |
| LDR | Symantec Ghost Template File |
| LDS | Corel40 Programs Data File |
| LDS | Laser Dispatch Script |
| LDS | Trane Trace Load |
| LDS | LOUDNESS Sound System |
| LD_ | Visc15 Adressen Setup File |
| LE | DOS/4GW PM 32X DOS Extender Executable Image |
| LE$ | BASIC VB |
| LEECHGET | LeechGet Download Manager Temporary File (Martin Albiez) |
| LEF | Lenex XML Data (GeoLogix AS) |
| LEG | Legacy Graphic Format |
| LEN | PlatePrep |
| LEN | Sheffield Dictionary File |
| LEN | XNBC V8 Biological Neural Network Simulation Workstation Axon Lengths |
| LEP | Label and Envelope Designer Plus 2000 |
| LES | Learn Lesson File |
| LES | Lesson File |
| LES | Logitech Entertainment Game Profile |
| LES | Mklesson Lesson File |
| LET | Letter |
| LET | Maestro Icons File |
| LET | Creatacard Letterhead Project (Broderbund) |
| LET | Genesis 2000 (Genesis 2000, Inc.) |
| LET | Nuke Randomic Life Generator |
| LEV | NetHack Level File |
| LEV | Worms Armageddon Map |
| LEV | Worms World Party Map |
| LEV | Liero Level |
| LEX | HP-Basic Language Extension |
| LEX | Lexicon (Dictionary) |
| LEX | Lexmark Printer Install File |
| LEX | Acrobat (Adobe) |
| LEY | Leylines Map File or Saved Game (Crystal Shard) |
| LE_ | BASIC VB Compressed Disk1 File |
| LF | SoftwareKey License File |
| LFA | LifeForm File |
| LFA | IncrediMail Default Animations (IncrediMail Ltd.) |
| LFD | LucasArts Games Resource (Lucasfilm Entertainment Company Ltd.) |
| LFF | LucasFilm Format |
| LFL | LucasFilm Library |
| LFM | LifeForm File |
| LFP | LifeForm File |
| LFQ | LeechFTP Queue File |
| LFT | 3D Studio Loft File (Autodesk, Inc.) |
| LFT | ChiWriter Laser Printer Font |
| LFXM | FaceMail Text to Speech E-mail |
| LG | Archive Handler by George Lyapko |
| LG | Arhangel Compressed Archive |
| LG | Logo Procedure Definition |
| LGA | Windows Applog File |
| LGC | Audio |
| LGC | Corel Layout Designer Logic File for SGML |
| LGC | Logicator File |
| LGC | Program Use Log File |
| LGC | Windows Application Log |
| LGC | Screen Saver Toolkit (Stardust Software) |
| LGD | Windows Application Log |
| LGE | Windows Application Log |
| LGF | Legal Eagle Text File |
| LGF | ProWORX Nxt Log Book Note (Schneider Electric) |
| LGF | Windows Application Log |
| LGF | Logomotion Graphic File (Logotron Ltd.) |
| LGF | LeechGet Download Manager FTP Queue (Martin Albiez) |
| LGG | Windows Application Log |
| LGH | Windows Application Log |
| LGH | Pro/ENGINEER (PTC) |
| LGI | Windows Application Log |
| LGJ | Windows Application Log |
| LGK | Windows Application Log |
| LGL | Windows Application Log |
| LGL | LeechGet Download Manager Download Queue (Martin Albiez) |
| LGM | Windows Application Log |
| LGN | Windows Application Log |
| LGO | SuperFax Header/Footer Logo |
| LGO | Windows Logo Driver (Microsoft) |
| LGO | Modern ListGeo Output |
| LGO | MSWLogo Saved Logo Design (Softronics, Inc.) |
| LGP | Logotron SuperLogo File |
| LGP | Windows Application Log |
| LGP | Final Fantasy Game Archive (Square Enix Co., Ltd) |
| LGP | Logitech G15 Gaming Keyboard Profile File (Logitech) |
| LGQ | Windows Application Log |
| LGR | Elasto Mania Character Skin |
| LGR | Windows Application Log |
| LGS | Windows Application Log |
| LGT | The Sims Lighting File (Electronic Arts (Maxis)) |
| LGT | Urban Chaos Game File |
| LGZ | Windows Application Log |
| LH | Morph File |
| LHA | Compressed Archive File |
| LHP | Electric Butterfly |
| LHS | Literate Haskell Source File |
| LHW | Compressed Amiga Archive File |
| LHZ | LHA Compressed Archive File |
| LI$ | MS Compressed Library |
| LIA | P-CAD Schematic Library (Altium Limited) |
| LIB | Greeting Card Library |
| LIB | Library Used by an Application |
| LIB | Program Library Common Object File Format (COFF) (Microsoft) |
| LIB | Scholar's Aid Library File |
| LIB | AS/400 Physical File Library (IBM) |
| LIB | Sibelius House Style File (Sibelius Software Ltd) |
| LIC | Borland License File (Borland Software Corporation) |
| LIC | License File |
| LID | Dylan Library Interchange Description |
| LID | LabelVision Auto Incrementing Value File |
| LID | Light Field Description File |
| LID | Maple V Setup File (Maplesoft, a Division of Waterloo Maple Inc.) |
| LID | Quicken Ace Quicken 2002 Deluxe File |
| LID | Scholar's Aid Backup File |
| LID | WinDVD File |
| LIF | Knowledge Dynamics Install Archive |
| LIF | CA Clipper Installer Compressed File Archive |
| LIF | Compressed Archive File |
| LIF | Homeworld Layered Image Format File (Sierra) |
| LIF | HP Logical Interchange Format File |
| LIF | Game of Life Pattern File |
| LIF | TurboTax Information Archive (Intuit) |
| LIFE | Game of Life Pattern File |
| LIM | Limit Compressed Archive |
| LIN | ArcView ARC/INFO Lineset Symbol File (ESRI) |
| LIN | AutoCAD Linetype Definition (Autodesk, Inc.) |
| LIN | VAX Program Listing |
| LIN | Medlin Accounting Current Period Invoice Detail (Medlin Accounting) |
| LINO | LinoLab Source Code (Linova) |
| LINUX | File for Linux |
| LIP | SLIP |
| LIQ | CollegeBAR Bartending Software Liquor Cabinet |
| LIQ | Liquid Tracker Song/Module |
| LIR | Liram Application Save Application Setting (Liram Ltd.) |
| LIS | Compiler Listing File |
| LIS | Structured Query Reporting (SQR) Output |
| LIS | VAX Program Listing |
| LISP | LISP Translators File |
| LISPM | LISP Machine File Bitmap |
| LIST | BlindWrite (VSO-Software) |
| LIT | Movie |
| LIT | Reader eBook File (Microsoft Corporation) |
| LIT | AMOS Executable File (Alpha Micro) |
| LIV | LiveMotion SWF Movie |
| LIV | Living Actor Actor File (Cantoche) |
| LIVEREG | Symantec Norton Anti-Virus Update Session |
| LIVESUBSCRIBE | Symantec Norton Anti-Virus Update Catalog |
| LIVEUPDATE | Norton Anti-Virus Update Settings File (Symantec) |
| LIX | Extend Simulation Library File |
| LIX | Libronix DLS Resource |
| LIZ | Comprressed List File |
| LI_ | Rukus File |
| LJ | HP LaserJet Graphic Bitmap |
| LJ | Text File for HP LJ II Printer |
| LK | Advanced Revelation and OpenInsight Primary Data Storage Space (Revelation Software) |
| LKB | Faverly Data Recorder Output |
| LKO | Outlook Express Linked Object (Microsoft) |
| LKS | WinAmp Links File |
| LKT | Lookup Table |
| LKU | T9000 Linkable Unit |
| LL | Links Language Template File |
| LL | List and Label (combit GmbH) |
| LL3 | LapLink III Document File |
| LLB | LabVIEW Application Program Library (National Instruments Corporation) |
| LLC | LapLink Saved Connection File |
| LLD | Links Language Data File |
| LLG | LADSIM Ladder Logic Diagram (Bytronic Ltd) |
| LLP | Digital Chart of the World Data File |
| LLP | Lotto Logic 2002 Lottery Configuration File (Timersoft) |
| LLP | VersaPro Local Logic Block |
| LLT | Digital Chart of the World Data File |
| LLX | Laplink Exchange Agent |
| LLX | Tonline Ob4hbci File |
| LLX | List and Label Extension Object (combit GmbH) |
| LM8 | Picture File |
| LMA | Netscape Packetized Audio |
| LMD | ABBYY Finereader 4.0 Sprint (ABBYY Software House) |
| LMD | Tune Smithy List of Modes for a Musical Scale |
| LME | LegglessMusicEditor Sound/Module |
| LMI | HomePortal Firmware Recovery File (2Wire, Inc.) |
| LMK | Sprint-Layout Macro (ABACOM Ingenieurbüro) |
| LML | LOGML File |
| LMP | Doom Recorded Demo File (id Software) |
| LMP | Quake File |
| LMS | Light-O-Rama Lighting Control File (Light-O-Rama) |
| LMT | RPG Maker 2000/2003 Map Tree (Enterbrain) |
| LMU | RPG Maker 2000/2003 Map File (Enterbrain) |
| LMV | LEGO CAD Movie (The LEGO Group) |
| LMW | LMW Examples File |
| LMX | Lomax Software Game File |
| LN03 | DEC LN03+ Sixel Bitmap |
| LNB | Logomanager File |
| LND | 3D Landscape Data |
| LNF | Oyoaha lookandfeel Interface Elements (Oyoaha) |
| LNG | Acrobat Language Plug-in (Adobe) |
| LNG | Diablo II (Blizzard Entertainment) |
| LNG | Jasmine Language File |
| LNG | Lahey FORTRAN Language Extension |
| LNG | Language File |
| LNG | Lingo Script File |
| LNG | NRG SDR Language File |
| LNG | SourceEdit Language Definition |
| LNG | DeepBurner Language File (ASTONSOFT Co.) |
| LNG | Launch-n-Go Shared Keyboard Shortcuts (Tethys Solutions, LLC.) |
| LNK | Linker File |
| LNK | Windows Shortcut File (Microsoft Corporation) |
| LNK | Advanced Revelation Database File (Revelation Software) |
| LNK | XNBC V8 Biological Neural Network Simulation Workstation Link Configuration File |
| LNM | WordPerfect SGML Alias (Corel Corporation) |
| LNR | Lunar Invasion Saved Game |
| LNS | LinkStash Bookmark File |
| LNT | LiveNote Case File (LiveNote Technologies) |
| LNT | ARMACON Data File (LNT Engenharia [LNTinfopage]) |
| LNX | Lynx Project File (Zippety Software) |
| LNX | Atari Lynx ROM Image |
| LO | GNU Libtool Library Object File (GNU Project - Free Software Foundation) |
| LO4 | SeeYou Flight Data (Naviter) |
| LOC | Localisation String Resource Header File |
| LOC | MicroSim PCBoard Component Locations Report |
| LOC | Suppose Locations File |
| LOC | EasyGPS TerraByte Location File (TopoGrafix) |
| LOCAL | Xset Setup Program Bin File |
| LOCK | .NET Framework Database Lock File (Microsoft) |
| LOCKED | Softwrap Locked and Encrypted EXE File (Softwrap) |
| LOD | Load File |
| LOF | LaTeX Auxiliary File for List Of Figures |
| LOG | Log File |
| LOG | MS HTMLHelp Log |
| LOG | ProWORX Nxt Text Log File (Schneider Electric) |
| LOG | Pro/ENGINEER (PTC) |
| LOG | SeeYou Flight Data (Naviter) |
| LOGONXP | LogonStudio File Document (Stardock Corporation, Inc.) |
| LOK | FileWrangler/ZipWrangler/SecurDesk! Encrypted Archive |
| LOK | OmniPage Ver 9 File (ScanSoft, Inc.) |
| LOOP | Soundtrack Hinted Audio Loop (Apple) |
| LOP | Sierra Mastercook Layout File |
| LOT | LaTeX Auxiliary File for List Of Figures |
| LP | FlexRip/B |
| LP | Lightscape Preparation File |
| LP | LP88 Linear Programming for the IBM-PC File |
| LP | NASCAR Racing 2002 Track Configuration Options (Sierra) |
| LP3 | Hansen Software Label Printer |
| LP4 | Hansen Software Label Printer |
| LP7 | LP7Signer Digital Signed File (Lex Persona) |
| LPA | LPA-View Laser Particle Analyser Test Analysis Software |
| LPB | LP88 Linear Programming for the IBM-PC File |
| LPB | ProWORX Nxt Logic Pointer (Schneider Electric) |
| LPC | Linear Predictive Coding Sound |
| LPC | Teko Printer Driver |
| LPD | Helix Nuts and Bolts File |
| LPD | Label Pro Ver. 2.0-3.02 Data File (Avery) |
| LPD | LogonProcessor Configuration Database (VAI) |
| LPD | LECTURNITY Multimedia Audio/Video/Clips Presentation Document (IMC AG) |
| LPF | Lytec's Direct Electronic Medical Claims ClaimsDirect |
| LPF | ProWORX Nxt Logic Pointer (Schneider Electric) |
| LPG | Lowrey Organ Registration (Setup) File (Lowrey Organ Company) |
| LPI | Live Pictures |
| LPJ | PASSOLO Localization Project |
| LPJ | SoftwareShield License Manager License Project File (SoftwareShield Technologies Inc.) |
| LPK | License Package |
| LPL | Darkstone Character Information File |
| LPN | LVPlan - Planification of Low Voltage Aerial Distribution Networks |
| LPP | Let's Photo Photo Slideshow (Canopus Co., Ltd.) |
| LPR | LAPRO Source Code File (Marco Mugnatto) |
| LPROJ | Mac OS X Localized Project Folder |
| LPT | LogPlot/LogView Compiled Boring Log (RockWare, Inc.) |
| LPU | PASSOLO Localization Project |
| LQF | Leech FTP Save Queue File |
| LQP | Liquid Audio Player Passport File (Geneva Media, LLC) |
| LQT | Liquid Audio Player File (Geneva Media, LLC) |
| LQT | Winamp File |
| LR | Chaos Desktop Layer List (Chaos systems AB) |
| LRC | Intel Video Phone File |
| LRC | Dance With Intensity |
| LRF | C/C++ Linker Response File (Microsoft) |
| LRG | Macromedia XRes Multi-resolution Bitmap |
| LRM | Encarta Class Server Learning Resource (Microsoft) |
| LRP | IBM Works for OS/2 Report |
| LRP | Linux Router Project Package |
| LRR | Mercury LoadRunner Test Results File (Mercury Interactive Corporation) |
| LRS | Daylon Leveller Rendition Style |
| LRS | Language Resource File (Corel) |
| LRS | Mercury LoadRunner Scenario (Mercury Interactive Corporation) |
| LRT | Yacc Log File |
| LRZ | Lotto Hat File |
| LS | Freeware Dictionary Project Data File |
| LS | Lightscape Solution File |
| LS | Links 98 Game File |
| LS | Unix ls Directory File |
| LS1 | OzWin CompuServe E-mail/Forum Access Library Listing |
| LS1 | Winhelp Source file |
| LS1 | Cokriging Software VARIO Output File |
| LS2 | Cokriging Software COREG Output File |
| LSA | LightScape Technologies ASCII Data |
| LSA | Liquid Audio Player Skin File (Geneva Media, LLC) |
| LSB | LightScape Technologies Binary Data |
| LSC | Tune Smithy List of Muscial Scales |
| LSC | LOGO!Soft Comfort Circuit File (Siemens AG) |
| LSD | Fifa World Cup Game Data Environment File |
| LSD | RPG Maker 2000/2003 Saved Game File (Enterbrain) |
| LSD | ABBYY Lingvo Non-changaeble System Dictionary (ABBYY Software House) |
| LSD | LECTURNITY Presentation File Source Format (IMC AG) |
| LSE | Audio Manager (Nokia) |
| LSF | Libronix DLS Resource |
| LSF | Streaming Audio/Video File |
| LSF | Totem Cash Profile File |
| LSG | LocStudio Glossary (Microsoft) |
| LSI | Audio |
| LSI | Corel Layout Specification Instance SGML |
| LSL | Corel Paradox Saved Library |
| LSL | Daylon Leveller Shape List |
| LSL | Lotus Script Library (IBM) |
| LSL | Liquid Audio Player Resource DLL (Geneva Media, LLC) |
| LSN | Works File (Microsoft) |
| LSO | BHV Tonstudio Platin File |
| LSO | Logic Audio File |
| LSP | AutoLISP Application Source Code (Autodesk, Inc.) |
| LSP | LISP Program File |
| LSP | Living Scenes Jigsaw Puzzles |
| LSQ | CalTech PaleoMag Least Squares Format |
| LSQ | IBM Voice Type Language Addword File |
| LSQ | VAX CRYSTALS Chemical Crystallogaphy File |
| LSR | Logos Library System 2.x Standard Reference Definition |
| LSS | Legato Spreadsheet |
| LSS | LotusScript Program File |
| LST | 1st Reader Keyboard Macro |
| LST | Family Tree Maker Error File |
| LST | Ingres Dump List File (Computer Associates International, Inc.) |
| LST | Listing or List |
| LST | Oracle Spool File |
| LST | OzWin CompuServe E-mail/Forum Access Library Listing |
| LST | PowerPoint View File (Microsoft) |
| LST | BPM Studio Play List (ALCATech) |
| LST | Pro/ENGINEER Temporary File (PTC) |
| LST | Orchida Knitting System (Orchida Soft) |
| LST | SignIQ Field List (ImpulseLogic) |
| LSW | Golf Swapfiles File |
| LSW | Technics Keyboard Current Panel File |
| LSX | Streaming Audio/Video Shortcut |
| LSZ | Adressmn File |
| LSZ | WinFax (Symantec) |
| LSZ | LiteStep Installer Theme File (beyondconvention) |
| LS_ | Unix ls Directory File |
| LT | PC LTAS Printer Configuration File |
| LT2 | Curious Labs Poser Lighting File |
| LTB | Amma Lsb v1.0 |
| LTD | LivingTime Data File (Lifescope Inc.) |
| LTE | Adressmn |
| LTF | Frogans Short-cut (STG Interactive SA) |
| LTG | Lasertank Bitmap Graphics |
| LTH | Sierra Print Artist Letterhead |
| LTL | Linear Temporal Logic Formula |
| LTM | EOSAT Landsat Thematic Mapper Bitmap Data |
| LTM | Lotus Form (IBM) |
| LTM | LiteMail Database/Project (Sprika Software) |
| LTPL | Insight II Layout Template File (Accelrys Software Inc.) |
| LTR | ACT! Letter (Best Software CRM Division) |
| LTR | Letter |
| LTT | HP Library and Tape Tools Log File |
| LTT | SDR99 Speech Recognition Task Lexical TREC Transcription |
| LTT | MicroImages Text Layout (MicroImages, Inc.) |
| LTX | LaTeX Mathematical Text Document |
| LU | ThoughtWing Library Unit File |
| LUA | Lua Source (Tecgraf - Computer Graphics Technology Group) |
| LUCS | Amaya Tools |
| LUDI_PSEUDO_PROTEIN | Insight II Exclusion Shell File (Accelrys Software Inc.) |
| LUL | OzWin CompuServe E-mail/Forum Access Upload |
| LUN | DB-MAIN Project File (REVER S.A.) |
| LUP | OzWin CompuServe E-mail/Forum Access Library Update |
| LUT | LUT File |
| LUT | Osiris Prefs Colordir File |
| LUX | Spectramap Database (Coloritto BV) |
| LUXB | Lux Saved Map File (Sillysoft) |
| LV1 | Boulder Rash Original Single Level |
| LVA | Logitech Video Effects Avatar and Face Accessory (Logitech) |
| LVB | Outlaws Binary Mission Files (LucasArts Entertainment Company LLC) |
| LVD | LPA-View Data File (MP Filtri U.K. Ltd.) |
| LVF | Logitech Video Effects Avatar and Face Accessory (Logitech) |
| LVL | Boulder Rash Original Full Levels |
| LVL | Lasertank Level |
| LVL | Max Payne Uncompiled Level File (Rockstar Games) |
| LVL | Parallax Miner Descent/D2 Level Extension Level Extension |
| LVL | Snood Game Level |
| LVP | Lucent Voice Player |
| LVP | LView Pro Image |
| LVS | Daylon Leveller Selection Mask |
| LVT | Outlaws Text Mission Files (LucasArts Entertainment Company LLC) |
| LVW | Daylon Leveller View File |
| LW | LightWave (ClearJump) |
| LW | Line Work TIFF Bitmap |
| LW3 | Lightwright File |
| LWA | LightWorks Archive (LWA) Material/Scene File (LightWork Design Ltd.) |
| LWC | Living Word Commentaries Bible File |
| LWD | LotusWorks Text Document (IBM) |
| LWF | LuraWave-compressed Graphic File |
| LWI | LightWorks Image (LightWork Design Ltd.) |
| LWM | LittleWays Map (hfrmobile) |
| LWO | LightWave 3D Object (NewTek) |
| LWP | IBM Works for OS/2 Document |
| LWP | Wordpro 96/97 Document (IBM) |
| LWS | Lightwave 3D Object Layout (NewTek) |
| LWV | Linguistically Enhanced Sound File (Microsoft) |
| LX | LPEX Customization Command Profile |
| LXA | Office Speech Lexicon File (Microsoft) |
| LXD | Lexacom Data File (Aprobrium Limited) |
| LXD | eDictionary Reader Dictionary Data File (PPCLINK) |
| LXF | SPLASH Lenex Compressed Data (GeoLogix AG) |
| LXF | LEGO CAD Scene File (The LEGO Group) |
| LXFML | LEGO CAD Digital Designer XML Data (The LEGO Group) |
| LXG | LEGO CAD PC/Macintosh Exchange Format (The LEGO Group) |
| LXL | LPEX File Open Command Profile |
| LXM | Lexacom Mobile PDA Dictation File (Aprobrium Limited) |
| LXN | SeeYou Flight Data (Naviter) |
| LXO | LaserMaster Font |
| LXS | LPEX File Save Command Profile |
| LXW | Lexacom Talk & Type Dictation File |
| LY | GNU LilyPond |
| LY+ | DataCAD Plus Layer (DATACAD LLC) |
| LYR | DataCAD Layer File (DATACAD LLC) |
| LYR | Lyrics for Audio CD |
| LYR | Song Lyric File |
| LYS | DataCAD Layer Control File (DATACAD LLC) |
| LYT | SignMaking Application Extension |
| LYT | TurboTax Install Log File (Intuit) |
| LYT | MicroImages Text Layout (MicroImages, Inc.) |
| LYT | DESQview (Symantec) |
| LYX | LyX |
| LZA | LZA Animation/Video |
| LZD | Binary Difference File |
| LZF | 3ds Max Lens Effect Flare (Autodesk, Inc.) |
| LZH | Compressed Archive File |
| LZO | lzop Compressed Archive |
| LZS | Compressed Archive File |
| LZS | LARC Compressed File Archive |
| LZS | Skyroads Data File |
| LZW | Compressed Amiga Archive File |
| LZW | LHWarp Compressed Amiga File Archive |
| LZX | Compressed File |