| sl2 | Lowrance Sonar Log v2 File |
| sl3 | SQLite 3 Database |
| slb | Multiframe Sections Library |
| slc | SLiCe Format Data |
| sldasm | SolidWorks Assembly Document |
| sldblk | SolidWorks Blocks File |
| sldftp | SolidWorks Form Tool File |
| sldlfp | SolidWorks Library Features File |
| sldmat | SolidWorks Material Database |
| sldpart | SolidWorks Part Document |
| sldprt | SolidWorks Part Document |
| sldstd | SolidWorks Drafting Standards Data |
| slg | Symantec Endpoint Protection Database Log |
| slg | Lowrance Sonar Log File |
| slg | Autodesk AutoCAD Status Log |
| sli | EOS PSW SLI Data |
| slk | Symbolic Link Spreadsheet |
| slo | RenderMan Shader Data |
| slob | Slob Dictionary Data |
| slog | Autodesk Revit Worksharing Log |
| slr | SWAT Solar Radiation Data |
| slst | On Schedule Data |
| slt | ZX Spectrum Emulator SLT Snapshot |
| slt | DB/TextWorks Slot Log File |
| slu | Business Integrator Upgrade License Data |
| slw | Settler LITE Data File |
| slxp | MATLAB Protected Model |
| sm2 | SAS Multi-dimensional Database |
| sm3 | DataCAD Symbol File |
| sm4 | XPMPro 2.0 Data |
| sm7 | SAS Multi-dimensional Database |
| smap | WHAMM Segment Map File |
| smb | Autodesk Mapguide Symbol Library |
| smc | SNES ROM Image SMC |
| smd | Sega Genesis ROM |
