| prtprp | SolidWorks Parts Properties Template |
| prv | Windows Previous Bootlog File |
| prw | Artlantis Shader Preview |
| prx | Lucene Positions File |
| 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 | Scorelib PSC Data |
| psc | MODTRAN PSC Spectral Output File |
| pscp | Polyspace Code Prover Results Data |
| psdata | PicoScope Waveform Data |
| psfg | Nuance Speech Recognition Engine Grammar File |
| psg | AFP Page Segment Resource |
| psi | Affymetrix Probe Set Information |
| psml | PSML Page Definition |
| psmodel | Delcam PowerSHAPE 3D Model |
| psn | OptionVue Portfolio Manager Positions Data |
| psp | OvenWATCH Paste File |
| pspcache | Corel Paint Shop Pro Cache |
| pspshape | Corel Paint Shop Pro Shape Data |
| psr | Famous Report |
| psr | PowerSoft Report |
| pst | Microsoft Outlook Personal Folder File |
| pst | STAR-CD v3 Results Data |
| pstpl | LimeSurvey Template Data |
| pstt | STAR-CD v3 Transient Results Data |
| psv | PIPE-FLO Viewer Data |
| psw6 | Password Depot 6 Data File |
| psw8 | Password Depot Portable Data |
| pswx | Password Depot Portable Data |
| psyexp | PsychoPy Experiment Data |
| pt1 | WavePad Data |