| 261. | .stw | Data file (SmartTerm for Windows) |
| 262. | .stx | Bitmap graphics (Santa Barbara Instruments Astronomical Image) ◊ Electronic book (SmarText) ◊ Music format ◊ Statistics file (SPOT Image) ◊ Tax form (CA-Simply Tax) |
| 263. | .sty | Style library or sheet (many text and graphics programs) |
| 264. | .sub | Component package (Rational Rose) |
| 265. | .sui | Suit library (Simple User Interface Toolkit) |
| 266. | .sum | Summary |
| 267. | .sun | Bitmap graphics (Sun Rasterfile) |
| 268. | .suniff | Bitmap graphics (Sun TAAC Image File Format) |
| 269. | .sup | Bitmap graphics (Startup screen) ◊ Supplementary dictionary (WordPerfect) |
| 270. | .svd | Document autosave file (Microsoft Word) |
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