| pool | TeX Pool Data |
| por | SPSS Statistics Portable |
| pos | BrainVoyager QX Slice Positioning Data |
| pos | STK Position File |
| postal | TomTom Postal Code Database |
| pov-state | POV-Ray State File |
| pow | WAsP Power Curve |
| poz | Poser 1.0 Scene |
| pp2 | Poser Props Data |
| pp3 | RawTherapee Sidecar File |
| ppass | ParaPass Keystore |
| ppd | Polar ProTrainer Person Data |
| ppd | ProfiCAD Symbol Data |
| ppf | PPF-O-Matic Patch |
| pphe | PLINK Phenotype Permutations Data |
| ppi | Lifo-Pro Producer Price Index |
| ppk | PuTTY Private Key |
| ppl | PTC Creo Route Sheet Data |
| pplx | Osmose O-Calc Pro Database |
| pplz | Polar ProTrainer Training Plan |
| ppmd | ExtractNow PPMD Data |
| ppmx | Scorelib Paged Parameter MatriX Data |
| ppronote | PowerPro Note Data |
| pprot | NxSeq Long Mate Pair Library Kit Saved Parameters |
| ppw | Micrografx Picture Publisher Wizard |
| ppws | Enfocus PitStop Workspace Settings Data |
| ppz | Poser Compressed Props Data |
| pqb | Pleco Chinese Dictionary Database |
| pqe | Ontrack EasyRecovery Recovered Data |
| pqf | Corel Presentations Slideshow Runtime |
| pqo | PhreeqcI Data |
| pqr | PyMOL PQR Data |
| pqs | PQS Input File |
| pqt | Mail.dat Package Quantity File |
| pqw | Corel Presentations Slideshow Runtime |