| skt | SSEYO Koan Design |
| skt | SSEYO Koan Play Data |
| sku | TomTom for R-Link Map Update |
| skypechatstyle | Skype Chat Style Data |
| skypeemoticonset | Skype Emoticon Pack |
| sl | RenderMan Shader Source |
| sl2 | Lowrance Sonar Log v2 File |
| sl3 | SQLite 3 Database |
| slb | PSpice Symbols Library |
| slb | Multiframe Sections Library |
| slc | SLiCe Format Data |
| sldasm | SolidWorks Assembly Document |
| sldblk | SolidWorks Blocks File |
| sldbombt | SolidWorks BOM Template |
| sldclr | SolidWorks Color Palette Data |
| sldd | Simulink Data Dictionary |
| slddc | Simulink Data Dictionary Cache |
| sldedb | SolidWorks Database |
| sldftp | SolidWorks Form Tool File |
| sldgtolfvt | SolidWorks Geometric Tolerance Style |
| sldholtbt | SolidWorks Hole Table Template |
| sldlfp | SolidWorks Library Features File |
| sldmat | SolidWorks Material Database |
| sldprt | SolidWorks Part Document |
| sldrevtbt | SolidWorks Revision Table Template |
| sldsffvt | SolidWorks Surface Finish Style |
| sldstd | SolidWorks Drafting Standards Data |
| sldweldfvt | SolidWorks Weld Style |
| sldwldtbt | SolidWorks Weldment Cutlist Template |
| slef | Spectral Library Exchange Format Data |