| lrdata | Adobe Photoshop Lightroom Data |
| lrdb | Adobe Photoshop Lightroom 1.0 Database |
| lrpreview | Adobe Photoshop Lightroom Preview |
| lrq | GEAR License Request File |
| lrr | HPE LoadRunner Raw Results |
| lrtemplate | Adobe Photoshop Lightroom Template |
| ls | LayaAir Scene Data |
| ls | Lightscape Solution File |
| ls | Guitar Rig Loop Machine Data |
| ls3 | Band-in-a-Box Third-Party Styles |
| lsa | Lightscape ASCII Data |
| lsb | Lightscape Binary Data |
| lsc | LOGO!Soft Comfort Circuit File |
| lsc | Light-O-Rama Schedule File |
| lsd | ABBYY Lingvo Dictionary User Dictionary |
| lsdx | Apex Z3 Lighthouse Secure Data |
| lse | Oracle Utilities Load Analysis Input |
| lsg | LimeSurvey Group Structure XML |
| lsi | SAP Business Objects Local Security Information File |
| lsim | LogicSim Circuit |
| lsl | LightScribe Label |
| lsn | MakeMusic Finale Lesson |
| lsq | PaleoMag Least Squares Data |
| lsr | LANsurveyor Report |
| lst | E-Sword v8 Verse List |
| lst | Adobe Font List |
| lstx | E-Sword v9 Verse List |
| lsu | LANsurveyor Map |
| lsw | DxLibraryStudio Workspace |
| lsz | Litestep Theme File |
| lt | Moltemplate Data File |
| lt2 | Poser Light Data |
| lta | Monolith LithTech Game Engine Data |
| ltc | Linguistic Tree Constructor Data |
| ltcx | Linguistic Tree Constructor XML Data |
