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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .LLB | National Instruments | Data Files | LabVIEW Library File | LabVIEW | National Instruments |
| .LLF | Unknown Developer | Data Files | IITM Local Language Data | IITM | Unknown Developer |
| .LLV | Locklizard | Data Files | Lizard Safeguard License | Lizard Safeguard PDF Security | Locklizard |
| .LMD | ABBYY | Data Files | Abbyy Finereader Sprint File | ABBYY FineReader | ABBYY |
| .LMH | Open Source | Data Files | Memory Hacking Software Memory File | Memory Hacking Software | Open Source |
| .LMR | Intuit, Inc. | Data Files | QuickBooks Loan Manager Data | QuickBooks | Intuit, Inc. |
| .LMT | ENTERBRAIN, INC. | Data Files | RPG Maker 2000/2003 Map Tree | RPG Maker VX | ENTERBRAIN, INC. |
| .LMX | Nokia | Data Files | Landmark Exchange File | Nokia PC Suite | Nokia |
| .LNB | Mike Bradley | Data Files | Logomanager File | LogoManager | Mike Bradley |
| .LNF | Open Source | Data Files | Oyoaha Lookandfeel Interface Elements File | oyoaha lookandfeel | Open Source |
| .LNG | Nullsoft | Data Files | Winamp Language File | Nullsoft Winamp | Nullsoft |
| .LNGX | Dominik Reichl | Data Files | KeePaas Language Data | KeePass Password Safe | Open Source |
| .LNM | Corel | Data Files | Corel WordPerfect SGML Alias File | Corel WordPerfect | Corel |
| .LNS | AVG Technologies | Data Files | AVG Anti-Virus Language Data File | AVG Antivirus | AVG Technologies |
| .LNT | Gimpel Software | Data Files | PC-lint/FlexeLint Configuration File | Microsoft Notepad | Microsoft Corporation |
| .LOAD | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOADER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOAN | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOC | TopoGrafix | Data Files | GPS Location File | EasyGPS | TopoGrafix |
| .LOCAL | Embarcadero Technologies | Data Files | Delphi User-Specific Project Options | Delphi (IDE) | Embarcadero Technologies |
| .LOCALSTORAGE | Data Files | WebKit Local Storage Data File | Google Chrome | ||
| .LOG | Unknown Developer | Data Files | Log File | Microsoft Notepad | Microsoft Corporation |
| .LOGO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LOGON | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .LOT | Leslie Lamport | Data Files | LaTeX List Of Tables | LaTex | Leslie Lamport |
| .LP1 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .LP7 | Lex Persona | Data Files | LP7 Digital Signed File | LP7Creator | Lex Persona |
| .LPA | MP Filtri | Data Files | LPA View Laser Particle Analyser Data | LPA View | MP Filtri |
| .LPD | GNU Project | Data Files | LPD Daemon Print Permissions File | Vim | Bram Moolenaar |
| .LPF | Orgadata AG | Data Files | Orgadata LogiKal File | LogiKal | Orgadata AG |
| .LPI | Unknown Developer | Data Files | Laser Printer Information | Unknown Software | Unknown Developer |
| .LPJ | Interscape | Data Files | LIMDEP Project | LIMDEP | Interscape |
| .LPK | ESRI | Data Files | ArcGIS Layer Package | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .LPN | n.v. Systems Europe s.a. | Data Files | LVPLAN Data | LVPLAN | n.v. Systems Europe s.a. |
| .LPP | CyberLink | Data Files | LabelPrint Project File | CyberLink LabelPrint 2.5 | CyberLink |
| .LPS | DAZ 3D | Data Files | Bryce Leaf Shape File | DAZ 3D Bryce | DAZ 3D |
| .LPT | Interscape | Data Files | LogPlot Compiled Boring Log File | LogPlot | Interscape |
| .LQ | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .LQA | Vernier Software & Technology | Data Files | Logger Pro Automatic Update | Vernier Logger Pro | Vernier Software & Technology |
| .LQF | Open Source | Data Files | LeechFTP Saved Queue | LeechFTP | Open Source |
| .LQM | LG Electronics | Data Files | LG QuickMemo Note | LG QuickMemo | LG Electronics |
| .LQP | Liquid Audio Inc | Data Files | Liquid Audio Player Passport Data | Liquid Audio Player | Liquid Audio Inc |
| .LQU | LeapWare | Data Files | LeapFTP Queue Data | LeapFTP | LeapWare |
| .LR | Adtollo | Data Files | Chaos Desktop Layer List File | Chaos desktop | Adtollo |
| .LRM | Microsoft Corporation | Data Files | Encarta Class Server Learning Resource File | Microsoft Encarta | Microsoft Corporation |
| .LRT | Aequus Gaming LTD | Data Files | League Of Legends Replay File | LOLReplay | Aequus Gaming LTD |
| .LRV | Konica Minolta | Data Files | Konica Minolta Data Management Software Stored File | Konica Minolta Data Management Software | Konica Minolta |
| .LSD | ENTERBRAIN, INC. | Data Files | RPG Maker Game Save File | RPG Maker VX | ENTERBRAIN, INC. |
| .LSF | Interscape | Data Files | Logos Library System File | Logos Bible Software | Interscape |
| .LSI | Hewlett-Packard | Data Files | Xerox Lightscribe Label | LightScribe Template Labeler | Hewlett-Packard |
| .LSL | Corel | Data Files | Corel Paradox File | Corel Paradox | Corel |
| .LSP | Open Source | Data Files | Lisp Program Source Code File | MacroMates TextMate | MacroMates |
| .LSQ | IBM | Data Files | IBM Voice Type Languages Addword Data | IBM Voice Type | IBM |
| .LSR | SolarWinds Inc. | Data Files | LANsurveyor Report | LANsurveyor | SolarWinds Inc. |
| .LST | Unknown Developer | Data Files | Data List | LibreOffice | The Document Foundation |
| .LT | Andrew Jewett | Data Files | Moltemplate Data File | Moltemplate | Andrew Jewett |
| .LTD | Lifescope Inc | Data Files | LivingTime Data File | LivingTime | Lifescope Inc |
| .LTM | IBM | Data Files | IBM Lotus Forms Form | IBM Lotus Forms Viewer | IBM |
| .LTT | Hewlett-Packard | Data Files | HP Library And Tape Tools Log | Notepad++ | Don Ho |
| .LTX | GSC Game World | Data Files | S.T.A.L.K.E.R. Properties File | GSC Game World S.T.A.L.K.E.R.: Call of Pripyat | GSC Game World |
| .LUAR | UltraDefrag Development Team | Data Files | UltraDefrag Lua Report | UltraDefrag | UltraDefrag Development Team |
| .LUB | Interscape | Data Files | Lua Bytecode | LUA | Interscape |
| .LUCIDCOLORSET | The Escapers | Data Files | Lucid Color Set File | Lucid | The Escapers |
| .LUCY | HTC | Data Files | HTC Scribble Note | HTC Scribble | HTC |
| .LUD | ABBYY | Data Files | Lingvo User Dictionary File | ABBYY Lingvo Dictionary | ABBYY |
| .LUM | Kevin Chong | Data Files | Luminous Song List | Luminous | Kevin Chong |
| .LUT | Lutron Electronics Co., Inc | Data Files | RadioRA Essentials Project Database | Lutron Electronics RadioRA Essentials | Lutron Electronics Co., Inc |
| .LVM | National Instruments | Data Files | LabVIEW Measurement File | LabVIEW | National Instruments |
| .LVS | Daylon Graphics | Data Files | Daylon Leveller Selection Mask File | Daylon Leveller | Daylon Graphics |
| .LVW | New Wave Concepts | Data Files | Livewire Document | LiveWire | New Wave Concepts |
| .LW | NewTek | Data Files | LightWave 3D Binary File | LightWave 3D | NewTek |
| .LW2 | Johm Mackernon Software | Data Files | Lightwright Version 2 Show Data File | LightWright | Johm Mackernon Software |
| .LW4 | Johm Mackernon Software | Data Files | Lightwright File | LightWright | Johm Mackernon Software |
| .LW5 | Johm Mackernon Software | Data Files | Lightwright File | LightWright | Johm Mackernon Software |
| .LWD | EditShare | Data Files | Lightworks Data File | Lightworks | EditShare |
| .LWO | NewTek | Data Files | LightWave 3D Object File | Poser | Smith Micro Software |
| .LWP | IBM | Data Files | Lotus Word Pro Document | IBM Lotus Word Pro | IBM |
| .LWR | Atari Corporation | Data Files | RollerCoaster Tycoon Laser Writing File | RollerCoaster Tycoon | Chris Sawyer |
| .LXE | Foundry | Data Files | Luxology Modo Environment Preset | Modo | Foundry |
| .LXF | The LEGO Group | Data Files | LEGO Digital Designer Model File | LEGO Digital Designer | The LEGO Group |
| .LXK | Open Source | Data Files | Lexicon Link-up File | COREX | Open Source |
| .LY | GNU Operating System | Data Files | LilyPond File | LilyPond | GNU Project |
| .LYC | SPGPrints Group | Data Files | BestIMAGE Compressed Design File | spgprints bestIMAGE | SPGPrints Group |
| .LYT | Adminsoft | Data Files | Adminsoft Document Layout File | Adminsoft | Adminsoft |
| .LYX | Open Source | Data Files | XWE File | XWE | Open Source |
| .LZZZZZZZ | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
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