| 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 |
| printerexport | Windows Printer Migration Data |
| priv | Splinter Private Key |
| private | OpenSSL Private Key Data |
| privy | PrivyPad Data |
| prizm | Prizm Viewer Image List |
| prj | Binary Terrain Data |
| prj | ESRI ArcInfo Projections Definition Data |
| prjm | projectM Music Visualizer Preset |
| prk | Campground Master Database |
| prklog | Campground Master Log |
| prl | Corel Paint Shop Pro Rough Leather Preset |
| prl | E-Sword v8 Prayer Request |
| prl | PRELIS Syntax Data |
| prl8 | 3D Proliner Measurement Data |
| prlgpreset | Korg Prologue Preset Collection |
| prlx | E-Sword v9 Prayer Request |
| prm | Bosch VisualMotion System Data |
