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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .L2R | NCSoft | Game Files | Lineage II Replay File | NCSOFT Lineage II | Interscape |
| .LA1 | LucasArts Entertainment Company, LLC | Game Files | LucasArts Game Data File | The Curse of Monkey Island | LucasArts Entertainment Company, LLC |
| .LAN | ESRI (Environmental Systems Research Institute) | Game Files | ERDAS LAN File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .LANG | Mojang | Game Files | Minecraft Language File | Microsoft Notepad | Microsoft Corporation |
| .LBA | ShopTalk Systems | Game Files | Liberty BASIC Source Code | Liberty Basic | ShopTalk Systems |
| .LBI | Adobe Systems Incorporated | Game Files | Dreamweaver Library Item | Adobe Dreamweaver | Adobe Systems Incorporated |
| .LBM | Electronic Arts | Game Files | Deluxe Paint Bitmap Image File | Canvas X | ACD Systems |
| .LBW | CCP Games | Game Files | CCP Log Server Utility Log File | EVE Online | CCP Games |
| .LCO | PopTop Software Inc. | Game Files | Railroad Tycoon 3 Locomotive Properties | Railroad Tycoon 3 | PopTop Software Inc. |
| .LDB | Microsoft Corporation | Game Files | Microsoft Access Lock File | Microsoft Access | Microsoft Corporation |
| .LDW | LDW Software | Game Files | Virtual Villagers Saved Game File | LDW Virtual Villagers | LDW Software |
| .LEC | LucasArts Entertainment Company, LLC | Game Files | LucasArts Game Resource | Loom | LucasArts Entertainment Company, LLC |
| .LEV | Interscape | Game Files | NetHack Level File | NetHack | Interscape |
| .LFD | LucasArts Entertainment Company, LLC | Game Files | LucasArts Game Resource | Loom | LucasArts Entertainment Company, LLC |
| .LFL | LucasArts Entertainment Company, LLC | Game Files | LucasArts Games Resource File | ScummVM | Interscape |
| .LFR | Marti wong | Game Files | Little Fighter File | Little fighter | Marti wong |
| .LGL | Open Source | Game Files | LeechGet Download List | LeechGet | Open Source |
| .LGP | Microsoft Corporation | Game Files | Microsoft Windows Application Log File | Microsoft Windows | Microsoft Corporation |
| .LGT | Microsoft Corporation | Game Files | Let's Go! Theme File | Let's Go! | Microsoft Corporation |
| .LIF | The LEGO Group | Game Files | LEGO Digital Designer Assets File | LEGO Digital Designer | The LEGO Group |
| .LIP | CELSYS | Game Files | Clip Studio Paint File | CELSYS Clip Studio Paint Pro | CELSYS |
| .LIT | Microsoft Corporation | Game Files | Microsoft Reader eBook File | Calibre | Open Source |
| .LL | Combit | Game Files | List & Label Preview File | List&Label | Combit |
| .LMP | id Software | Game Files | Quake Engine Lump File | Doom | id Software |
| .LMU | ENTERBRAIN, INC. | Game Files | RPG Maker Map File | RPG Maker VX | ENTERBRAIN, INC. |
| .LNC | Sports Interactive | Game Files | Football Manager Player Data | Football Manager 2016 | Sports Interactive |
| .LNGP | 11 bit studios | Game Files | This War Of Mine Language Localization Pack | This War Of Mine | 11 bit studios |
| .LNZ | Ubisoft | Game Files | Petz Linez Data | Petz | Ubisoft Blue Byte |
| .LOC | TopoGrafix | Game Files | GPS Location File | EasyGPS | TopoGrafix |
| .LOCK | Mozilla | Game Files | Lock File | Mozilla Firefox | Mozilla |
| .LOD | Ubisoft | Game Files | Homeworld Level Of Detail Data | Homeworld | Relic Entertainment |
| .LPR | Relic Entertainment | Game Files | Homeworld File | Homeworld 2 | Sierra Entertainment |
| .LRF | Aequus Gaming LTD | Game Files | League Of Legends Replay File | LOLReplay | Aequus Gaming LTD |
| .LRM | Microsoft Corporation | Game Files | Encarta Class Server Learning Resource File | Microsoft Encarta | Microsoft Corporation |
| .LRT | Aequus Gaming LTD | Game Files | League Of Legends Replay File | LOLReplay | Aequus Gaming LTD |
| .LSD | ENTERBRAIN, INC. | Game Files | RPG Maker Game Save File | RPG Maker VX | ENTERBRAIN, INC. |
| .LSV | Light-O-Rama | Game Files | Light-O-Rama Sequence Editor Visual Preference File | Light-O-Rama | Light-O-Rama |
| .LSW | Technics | Game Files | Technics Keyboard Current Panel File | Unknown Software | Unknown Developer |
| .LSX | Microsoft Corporation | Game Files | Streaming Media Shortcut | Microsoft Windows Media Player | Microsoft Corporation |
| .LTG | JEK Software | Game Files | LaserTank Graphics File | LaserTank | JEK Software |
| .LTR | Sublime HQ Pty Ltd | Game Files | Letter Document | Microsoft Notepad | Microsoft Corporation |
| .LTX | GSC Game World | Game 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 |
| .LUG | Unknown Developer | Game Files | Game Data | Dragon UnPACKer | Open Source |
| .LUXB | Sillysoft Games | Game Files | Lux Map File | Lux | Sillysoft Games |
| .LVB | LucasArts Entertainment Company, LLC | Game Files | Outlaws Game File | Outlaws | LucasArts Entertainment Company, LLC |
| .LVL | Unknown Developer | Game Files | Game Level File | Various video games | Various Developers |
| .LVZ | Open Source | Game Files | Continuum Zone Data Graphics | Subspace Continuum | Open Source |
| .LZS | Open Source | Game Files | LARC Compressed File Archive | ZipZag | Open Source |
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