| ppronote | PowerPro Note Data |
| pprot | NxSeq Long Mate Pair Library Kit Saved Parameters |
| ppw | Micrografx Picture Publisher Wizard |
| ppws | Enfocus PitStop Workspace Settings Data |
| ppz | Poser Compressed Props Data |
| pqb | Pleco Chinese Dictionary Database |
| pqe | Ontrack EasyRecovery Recovered Data |
| pqf | Corel Presentations Slideshow Runtime |
| pqo | PhreeqcI Data |
| pqr | PyMOL PQR Data |
| pqs | PQS Input File |
| pqt | Mail.dat Package Quantity File |
| pqw | Corel Presentations Slideshow Runtime |
| pqx | Power Quest Drive Image Index Data |
| 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 |
| preview7 | WindowBlinds Temporary Data |
| prex | Prex Data |
| prezi | Prezi Desktop Presentation |
| prf | ArchiCAD Favorites Data |
| prf | hyperMILL CAM Profile Data |
| prf | Microsoft Outlook Profile |
| prf | MOUSE HD Results Data |
| prfl | Netscape for Mac User Profile Data |
| pri | Migration Wizard Primary IFF File |
| pri | Primo Emulator Image |