| preinst | Debian Package Pre-installation Script |
| prep | AMBER Prep Format File |
| prerm | Debian Package Pre-removal Script |
| pretty | SAM Prettyalign Output |
| prev | Backup Exec Catalog Prev Data |
| preview7 | WindowBlinds Temporary Data |
| previous | Mac OS X Address Book Backup |
| prex | Prex Data |
| prezi | Prezi Desktop Presentation |
| prf | ArchiCAD Favorites Data |
| prf | FileNet eForms Form Preferences Data |
| prf | hyperMILL CAM Profile Data |
| prf | Microsoft Outlook Profile |
| prf | MOUSE HD Results Data |
| prf | PICS Rules Data |
| prf | Plot Station Plot Request Data |
| prfl | Netscape for Mac User Profile Data |
| prg | ABB RobotStudio RAPID Program |
| prg | Akai MPC2000 Program |
| prg | PC-DMIS Part Program |
| prg | RPG Toolkit Program |
| prg | Sharp MZ-series Emulator Program |
| pri | COREX Orthographic Transcription Data |
| pri | LocoScript Printer Definition Data |
| pri | Migration Wizard Primary IFF File |
| pri | Primo Emulator Image |
| pri | Source Insight Symbol Index |
| printcd2 | EPSON Print CD |
| printerexport | Windows Printer Migration Data |
| priv | Splinter Private Key |
