| 221. | .ps | Adobe PostScript document (text/graphics) |
| 222. | .ps2 | Adobe Level II PostScript document (text/graphics) |
| 223. | .ps3 | Adobe Level III PostScript document (text/graphics) |
| 224. | .psa | Archive (Pretty Simple Archive) (GNU PSA.OUT) |
| 225. | .psb | Sound Bank file (Pinnacle) |
| 226. | .psd | Bitmap graphics (Adobe Photoshop file) ◊ Definition file (Periscope Debugger) |
| 227. | .pse | Bitmap graphics (IBM printer Page SEgment) |
| 228. | .pseg | Bitmap graphics (IBM printer Page SEgment) |
| 229. | .psf | Outline PostScript printer font (ChiWriter) |
| 230. | .psi | A-law audio file (Psion) |
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