| 1. | .sl | S-Lang language source code file ◊ Save Layout extension (PACT) |
| 2. | .slb | Slide library (AutoCAD) ◊ Symbols library (P-CAD) |
| 3. | .slc | Compiled SALT script (Telix) |
| 4. | .sld | Slide (AutoCAD) |
| 5. | .sldasm | Vector graphics (SolidWorks assemblies 3D) |
| 6. | .slddrw | Vector graphics (SolidWorks drawing 3D) |
| 7. | .slddwg | Vector graphics (SolidWorks drawing 2D) |
| 8. | .sldprt | Vector graphics (SolidWorks drawing 3D) |
| 9. | .sli | Slide (MAGICorp Slide Service) |
| 10. | .slk | Data format (Sylk Symbolic Link format)(Excel - MultiPlan) |
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