| laby | Laby Level |
| lan | Deluxe Ski Jump 3 Language Data |
| lang | Minecraft Language Data |
| las | Laserstrike Game Level Data |
| lastlogin | Minecraft User Credentials Data |
| lba | Little Big Adventure Saved Game |
| lbf | BioShock Game Data |
| lbi | FIFA 2001 Game LBI Data |
| lbp | LittleBigPlanet Game Data |
| lbx | Master of Orion Game Data |
| lco | Railroad Tycoon 3 Locomotive Properties Data |
| ldb | Max Payne Game Level Data |
| Minecraft Level Data |
| RPG Maker 2000 Database |
| ldo | Delta Force Loadout Data |
| ldu | The Suffering: Ties That Bind Data |
| ldw | Virtual Villagers Game Data |
| lec | Loom Game Data |
| lemon | Sonic 3 A.I.R. Script |
| lev | Gex Game Data |
| Liero Game Level Data |
| NetHack Game Level Data |
| Return to Wonderland Game Level Data |
| Worms Game Level |
| level | Homeworld Level Data |
| level0 | Unity 3D Game Level |
| level1 | Unity 3D Game Level |
| level2 | Unity 3D Game Level |
| level3 | Unity 3D Game Level |
| level4 | Unity 3D Game Level |
| level5 | Unity 3D Game Level |
| ley | Leylines Game Data |
| lfd | LucasFilm Data |
| lff | LucasFilm Format Image |
| lfl | ScummVM LFL Library |
| lfr | Little Fighter 2 Data File |
| lgp | Final Fantasy VII Media Archive |
| lgr | Elasto Mania Character Skin |
| lgs | Another War Game Data |
| lgt | Age of Mythology Lighting Data |
| Urban Chaos LightMap Data |
| lhd | Two Worlds Level Header File |
| lhts | The Movies Editor Text String Database |
| lif | Game of Life Data |
| lin | X-Plane Painted Line Data |
| lip | Operation Flashpoint Lip Sync File |
| lipsync | Two Worlds Data File |
| lit | Quake Colored Light Data |
| ROSE Online Light Map Data |
| litemod | Minecraft LiteLoader Mod File |
| lkp | This War of Mine Custom Content Data |
| lll | 1000 Miglia Game Data |
| llm | Second Life Linden Lab Mesh |
| llsd | Second Life Linden Lab Structured Data |
| lmp | Baldurs Gate: Dark Alliance Game Data |
| Doom Recorded Demo Data |
| Left 4 Dead LMP Data |
| Quake Lump Data |
| The Bards Tale Game Data |
| lmt | RPG Maker 2000 Map Tree |
| lmu | RPG Maker 2000 Map |
| lnc | Football Manager LNC Data |
| lng | Crysis Language Data |
| lngp | This War of Mine Localization Package |
| lnr | Lunar Invasion Saved Game |
| lnz | Petz Game Linez Data |
| loc | TrackMania Locator Data |
| lock | Minecraft World Lock File |
| locres | Unreal Tournament Localization Resources Data |
| lod | A-10 Cuba! Weapons Loadout Data |
| Heroes of Might and Magic III Graphics Data |
| Homeworld Level of Detail Data |
| ROSE Online Level of Detail Data |
| lom | Lock On 3D Model |
| los | Close Combat 2 Map Data |
| love | LOVE Game |
| lp | NASCAR Racing 2002 Track Configuration Data |
| Star Wars: The Force Unleashed Levels Data |
| lpb | LaserTank Help File |
| lpq | Fairyland Game Data |
