| srtf | Sealed Rich Text Format Document |
| ssi | HTML Document with SSI |
| ssn | Samsung S Note File |
| st1 | DigiTitle Master Subtitle |
| stb | Named Plot Style Table |
| stc | OpenOffice Calc Template |
| std | StarOffice DrawingTemplate |
| step | Catia Document |
| step | ISO 10303 STEP Document |
| sti | StarOffice Impress Template |
| stl | StereoLithography Data |
| stml | Sealed HTML Document |
| story | Storyist Document |
| stp | Catia Document |
| stpz | Catia Compressed STEP Document |
| sttpl | Samsung Theme Designer Showcase |
| studio | Silhouette Studio Document |
| studio3 | Silhouette Studio Document |
| stw | StarOffice Writer Template |
| stx | Roxio Express Labeler Document |
| stxt | Sealed Text Document |
| sty | Corel Ventura Publisher Style Sheet |
| sty | LaTeX Style Definition |
| sty | Harvard Graphics Style |
| suck | SiteSucker Website Data |
| suml | Simple UML Diagram |
| svf | Simple Vector Format Document |
| svr | Superscape VR Compressed World |
| swar | SolidWorks Auto-recovery Document |
| swdoc | SymWriter 2 Document |
| swe | Sweater Wizard Document |
| swe | SendaWin Etiquetas Label |
| swg | SWAG Pascal Snippets |
| swgr | ClarisWorks 3 Drawing |
| swx | OpenOffice.org 1.0 Text Document |
