| pn | Powernoodle File |
| pna | TomTom Map Data |
| pnc1 | Norton Utilities Data |
| pnd | WinSLAMM Pond Data |
| pndd | Norton Utilities Disk Doctor Data |
| pnde | Norton Utilities Data |
| pnfd | Norton Utilities FileSaver 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 |
| pnk | PN-editor Petri Net Key Data |
| pnl | TopSolid Nesting Module |
| pnne | Norton Encrypt for Mac Data |
| pnnu | Norton Utilities Data |
| pnps | Programmer's Notepad State File |
| pnq | ICQ iFile Data |
| pnrf | Perception Native Recording Format Data |
| pns | Pegasus Mail Formatted Signature Data |
| pns | PN-editor Petri Net Simulation Data |
| pns | Popnogging Subject Data |
| pnsd | Norton Utilities Speed Disk Data |
| pnt | Popnogging Theme Data |
| pnt | SigmaWin+ Point Table Data |
| pnts | Cesium Point Cloud Data |
| 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 |