| pnu | Peernet Label Designer Data |
| pnue | Norton Utilities UnErase Data |
| pnv | Pegasus Mail Stored Searches Data |
| pnwi | Norton Utilities Wipe Info Data |
| pnz | Panorama Database File Set |
| po1 | STABCAL Data |
| po2 | STABCAL Data |
| po3 | STABCAL Data |
| po4 | STABCAL Data |
| po5 | STABCAL Data |
| pob | Punch CAD Object |
| pob | Punch! Home Design 3D Object |
| pob | Zemax Polygon Object Data |
| poc | PocoMail PocoScript |
| poco | Apple Guide POCO Data |
| podcast | JRiver Media Center Podcast |
| pof | Altera Programmer Object File |
| poi | BrainVoyager QX Patches-of-interest Data |
| poi | General POI Database |
| pok | Spectrum Games Database POKE Data |
| pol | AscToHTM Policy Data |
| pol | InnovMetric Polyworks Modeler 3D Model |
| poly | RMCProfile Polyhedral Restraints Data |
| polys | Ribbons Polygon Definition |
| pont | Protege Classes Data |
| pool | TeX Pool Data |
| popshape | PopChar Character Shape Data |
| por | Corel Painter Portfolio Data |
| por | eSignal Portfolio Data |
| por | SPSS Statistics Portable |
| pos | BrainVoyager QX Slice Positioning Data |
| pos | STK Position File |
| post | Yahoo! Messenger Post Data |
| postal | TomTom Postal Code Database |
| postinst | Debian Package Post-installation Script |
