| pr2 | Proteus Session Data |
| pr3 | CheckMark Payroll Employer Payees Data |
| pr4 | CheckMark Payroll Employer Checks Data |
| pr5 | CheckMark Payroll Distributions Data |
| prb | xyAlgebra Probabilities |
| prc | Palm OS Resource Code |
| 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 |
| pre | SonicWALL GMS Syslog 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 |
| 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 |
| pri | COREX Orthographic Transcription Data |
