| prm | TINA Pro Analyses Control Parameter File |
| prmdc | Adobe Premiere Metadata Cache |
| prnx | XtraReports PrintingSystem Document |
| pro | FEMFAT Result Protocol Data |
| pro | PATCHMASTER Protocol Editor Information |
| prob | PLINK Meta-analysis Rejected Variant List |
| prof | D-Fend Reloaded Profile Data |
| proj | Poseidon for UML Project Information |
| promizer | Promizer Data |
| prop | STK Propulsion for AMM File |
| prot | XEASY Chemical Shift List |
| protdb | Skyline Spectral Library Explorer Proteome Database |
| prox | POV-Ray DF3 Proximity Pattern Parameters |
| prp | Kodak Preps Data |
| prpt | Pentaho Reporting Archive |
| prr | Accent Office Password Recovery Data |
| prs | CorelDraw Print Style |
| prsl | Adobe Premiere Style Library Data |
| prt | PTC Creo Part Data |
| prt | BrainVoyager QX Protocol Data |
| prtdot | SolidWorks Part Template |
| 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 | SmartWare Plotter Description Data |
| psc | MODTRAN PSC Spectral Output File |
| pscp | Polyspace Code Prover Results Data |