| pqz | QuaSZ Style Palette |
| pr0 | CheckMark Payroll Company Data |
| pr1 | CheckMark Payroll Employees Data |
| pr2 | CheckMark Payroll Employee Checks Data |
| pr3 | CheckMark Payroll Employer Payees Data |
| pr4 | CheckMark Payroll Employer Checks Data |
| pr5 | CheckMark Payroll Distributions Data |
| prb | xyAlgebra Probabilities |
| prd | MAP Device Document |
| prep | AMBER Prep Format File |
| pretty | SAM Prettyalign Output |
| prex | Prex Data |
| prezi | Prezi Desktop Presentation |
| prf | ArchiCAD Favorites Data |
| prf | MOUSE HD Results Data |
| prf | Microsoft Outlook Profile |
| prf | hyperMILL CAM Profile Data |
| prfl | Netscape for Mac User Profile Data |
| pri | Primo Emulator Image |
| pri | Migration Wizard Primary IFF File |
| prj | Binary Terrain Data |
| prk | Campground Master Database |
| prl | E-Sword v8 Prayer Request |
| prl8 | 3D Proliner Measurement Data |
| prlgpreset | Korg Prologue Preset Collection |
| prlx | E-Sword v9 Prayer Request |
| prm | TINA Pro Analyses Control Parameter File |
| prm | Tinker Parameter File |
| prm | Bosch VisualMotion System Data |
| prmdc | Adobe Premiere Metadata Cache |
| prnx | XtraReports PrintingSystem Document |
| pro | FEMFAT Result Protocol Data |
| pro | PATCHMASTER Protocol Editor Information |
| prob | PLINK Meta-analysis Rejected Variant List |
| prof | D-Fend Reloaded Profile Data |