| 21. | .sto | Pascal stub OBJ file (Genus GX Kernel) |
| 22. | .stp | ISO-10303 STEP product data |
| 23. | .stq | Text file (Statistica) (StatSoft Software) |
| 24. | .str | Gate3 table structure file ◊ Screensaver file ◊ Structure list object file (dBASE Application Generator) |
| 25. | .sts | Project status info (Microsoft C/C++) ◊ Song format (Scream Tracker) |
| 26. | .stw | Data file (SmartTerm for Windows) |
| 27. | .stx | Bitmap graphics (Santa Barbara Instruments Astronomical Image) ◊ Electronic book (SmarText) ◊ Music format ◊ Statistics file (SPOT Image) ◊ Tax form (CA-Simply Tax) |
| 28. | .sty | Style library or sheet (many text and graphics programs) |
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