| pr5 | CheckMark Payroll Distributions Data |
| prb | xyAlgebra Probabilities |
| prd | MAP Device Document |
| pre | Altair FEKO PREFEKO Input Data |
| pre | Carlson 2016 Geologic Model Data |
| pre | Insight II Dynamics Scratch Data |
| pre | Nero WaveEditor Presets Data |
| prefetch | Microsoft Windows Prefetch Data |
| preinst | Debian Package Pre-installation Script |
| prep | AMBER Prep Format File |
| prerm | Debian Package Pre-removal Script |
| pretty | SAM Prettyalign Output |
| 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 |
| prfl | Netscape for Mac User Profile Data |
| pri | COREX Orthographic Transcription Data |
| pri | Migration Wizard Primary IFF File |
| pri | Primo Emulator Image |
| printcd2 | EPSON Print CD |
| printerexport | Windows Printer Migration Data |
| priv | Splinter Private Key |
| prj | Binary Terrain Data |
| prj | ESRI ArcInfo Projections Definition Data |
