| lgl | Large Graph Layout Edge File |
| lgl | LeechGet Download List |
| lgm | General Log |
| lgn | Microsoft Windows Application Log |
| lgn | OptionVue Portfolio Manager Log Notes |
| lgo | Modern ListGeo Output |
| lgpl | GNU GPL License Data |
| lgq | Microsoft Windows Application Log |
| lgs | Microsoft Windows Application Log |
| lgt | Vaisala LTraX Data |
| lgv | Windows Logger Log |
| lgw | ANSYS Saved Log |
| lgz | SmartOS Compressed Loopback Image |
| lgz | Windows Application Log |
| lh | LayaAir Sprite3D Data |
| lhd | ERL Server Database |
| lhi | ERL Server Index Data |
| lhi | TOPOG Landslide Hazard Index Data |
| lhm | ERL Server Metadata |
| lhp | Lighthouse Organizer Data |
| lhr | Intuit Quicken Financial Life for Mac File |
| li | Moku:Lab Data |
| li5 | LOGINventory 5 Data |
| lia | P-CAD Schematics Library |
| lib | BricsCAD Library |
| lib | Cadence OrCAD Library Data |
| lib | CIRCAD Source Library |
| lib | Finale Library Data |
| lib | FluidDraw Library |
| lib | Maple Repository Data File |
