| ps | ETCBC Phrase Structure Data |
| ps1 | ETCBC Phrase Structure Data |
| ps2 | ETCBC Word Parsing Data |
| ps3 | ETCBC Phrase Structure Data |
| ps4 | ETCBC Phrase Structure Data |
| ps7 | Corel Paint Shop Pro Data |
| psa | Adobe Photoshop Album Catalog |
| psafe3 | Password Safe Database |
| psar | Sony PSP Firmware Archive |
| psbf | Polyspace Results Data |
| psbrush | Corel Paint Shop Pro Brush |
| psc | MODTRAN PSC Spectral Output File |
| psc | Scorelib PSC Data |
| psc | SmartWare Plotter Description Data |
| pscp | Polyspace Code Prover Results Data |
| psdata | PicoScope Waveform Data |
| pse10db | Adobe Photoshop Elements Database |
| pse12db | Adobe Photoshop Elements Database |
| pse7db | Adobe Photoshop Elements Database |
| pse8db | Adobe Photoshop Elements Database |
| pse9db | Adobe Photoshop Elements Database |
| psedb | Adobe Photoshop Elements Database |
| pset | Mozilla Firefox Safebrowsing v2 Prefix Set |
| psf | LISREL 8 System Data |
| psfg | Nuance Speech Recognition Engine Grammar File |
| psg | AFP Page Segment Resource |
| psi | Affymetrix Probe Set Information |
| psin | PS-GVB Chemical Modeller Input Data |
| psivec | SUPPA diffSplice Output Data |
| psj | PLUS-Slitting Binary Job |