| pmppkg | Pegasus Mail Preferences Package |
| pmr | Windows NT Performance Monitor Report |
| pms | Pegasus Mail Signature Data |
| pmsf | Altera Partial-Mask SRAM Object File |
| pmw | Windows NT Performance Monitor Workspace |
| pmx | Scorelib Parameter MatriX Data |
| pmx | MikuMikuDance Polygon Model eXtend |
| pn | Powernoodle File |
| pna | TomTom Map Data |
| pnd | WinSLAMM Pond Data |
| pnff | Norton Utilities FastFind Data |
| pnfv | Norton Utilities FileSaver Volume Data |
| pnfx | Norton Utilities FileSaver Index Data |
| pngw | BlenderGIS PNG World Data |
| pni | Popnogging Image |
| pnl | TopSolid Nesting Module |
| pnps | Programmer's Notepad State File |
| pnrf | Perception Native Recording Format Data |
| pns | Pegasus Mail Formatted Signature Data |
| pns | Popnogging Subject Data |
| pnt | SigmaWin+ Point Table Data |
| pnt | Popnogging Theme Data |
| pnu | Peernet Label Designer 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 |
| poc | PocoMail PocoScript |
| pof | Altera Programmer Object File |
| poi | BrainVoyager QX Patches-of-interest Data |