L

File extensions starting with the letter L...

  .L    LEX Program File
        Link Instructions
        LISP Program File
  .LA   Lightscape Animation
  .LAB  Mailing Labels
  .LAT  Crossword Express Lattice File
  .LAY  Applause Word Chart Layout
        Lightscape Layer State
  .LBG  dBase IV Label Generator
  .LBI  Dreamweaver Library File
  .LBL  Labels (various)
  .LBM  Deluxe Paint Bitmap Graphic  [Viewer]
  .LBO  dBase IV Ordered Labels
  .LBR  Compressed Archive File
        Lotus 1-2-3 Display Driver
        Omnis7 Application File
  .LBS	Omnis Studio Application File
  .LBT  Foxpro Label Memo
  .LBX  Foxpro Label
  .LCF  Linker Control File  
  .LCH  PagePath Technologies LAUNCH! File
  .LCK  MS Frontpage-related File
        Adobe Pagemaker Database File
  .LCN  WordPerfect Dictionary File
  .LD   Telix Long Distance Codes
  .LD1  dBase Overlay File
  .LDB  MS Access Lock File
        TrueVector Log Database
  .LDF  LuraDocument File  [Viewer]
        MS SQL Server Transaction Log File
  .LDL  Corel Paradox Delivered Library
  .LEG  Legacy Graphic Format
  .LES  Learn Lesson File
        Logitech Entertainment Game Profile
  .LET  Letter
  .LEX  Lexicon (dictionary file)
  .LFT  Chiwriter Laser Printer Font
        3D Studio Loft File
  .LGC  Program Use Log File (for Windows Program Use Optimization)
  .LGO  MS Windows Logo Driver
  .LGP  Logotron SuperLogo File
  .LGT  Urban Chaos Game File
  .LHA  Compressed Archive File (LZH)
  .LHS  Literate Haskell Source File
  .LHW  Compressed Amiga Archive File  
  .LHZ  LHA Compressed Archive File
  .LIB  Program Library (diverse programmers' languages)
  .LIC  License File (various Shareware)
  .LIF  Compressed Archive File
        HP Logical Interchange Format File
  .LIN  AutoCAD Line Art
  .LIS  Program Listing
        Structured Query Reporting (SQR) Output
  .LIT  MS Reader EBook File
  .LIX  Logos Book File
  .LJ   Text File for HP LJ II Printer
  .LKO  MS Outlook Express Linked Object
  .LL3  LapLink III Document File
  .LLC  LapLink Saved Connection File
  .LLX  Laplink Exchange Agent
  .LM8  Picture File
  .LMD  Tune Smithy List of Modes for a Musical Scale
  .LND  3D Landscape Data
  .LNK  Linker File
        Windows Shortcut File
  .LOG  Log File (many different programs)
  .LOK  FileWrangler/ZipWrangler/SecurDesk! Encrypted Archive
  .LP   LP88 Linear Programming for the IBM-PC File
        Lightscape Preparation File
  .LPB  LP88 Linear Programming for the IBM-PC File
  .LPD  Helix Nuts and Bolts File (Helix Software now part of McAfee)
  .LQF  Leech FTP Save Queue File
  .LRC  Intel Video Phone File
  .LRF  Linker Response File
  .LRS  WordPerfect Language Resource File
  .LS   Lightscape Solution File
  .LSC  Tune Smithy List of Muscial Scales
  .LSF  Streaming Audio/Video File
        Logos Book File
  .LSL  Corel Paradox Saved Library
        Lotus Script Library
  .LSP  LISP Program File
  .LST  Listing or List (e.g., packing list)
        PowerPoint File
        Ingres Dump List File
        Oracle Spool File
  .LSX  Streaming Audio/Video Shortcut
  .LTM  Lotus Form
  .LTR  Letter
  .LU   ThoughtWing Library Unit File
  .LVL  Parallax Miner Descent/D2 Level Extension
  .LVP  Lucent Voice Player (Intuity Audix Multimedia Messaging System)
  .LWF  LuraWave-compressed Graphic File  [Viewer]
  .LWO  NewTek Lightwave® Object
  .LWP  Lotus Wordpro 96/97 File
  .LWS  NewTek Lightwave® Object Layout
  .LWV  MS Linguistically Enhanced Sound File
  .LYR  DataCAD Layer File
  .LYT  TurboTax Log File
        SignMaking Application Extension
  .LZH  Compressed Archive File
  .LZS  Compressed Archive File  
        Skyroads Data File
  .LZW  Compressed Amiga Archive File  
  .LZX  Compressed File