| pnf | Precompiled Setup Information File |
| pol | Windows Group Policy File |
| ppa | Microsoft PowerPoint Add-in |
| ppd | PostScript Printer Description |
| ppenc | Ashampoo Magical Security Encrypted File |
| ppn | Lexmark Printer Firmware |
| pp_ | Compressed PPD File |
| pqa | Palm Web Clipping Application |
| prj | General Project File |
| prlgprog | Korg Prologue Program |
| project | Unix Project Information |
| pset | Adobe InDesign Plug-in Set |
| psf | Adobe Photoshop Proof Settings |
| psp | Adobe Photoshop Preferences |
| pspscript | Corel Paint Shop Pro Script |
| ptq | Pianoteq Plug-in |
| pup | Sony Playstation 3 Update Package |
| pvl | Instalit Library |
| pwl | Windows 3.x Password List |
| pwz | Microsoft PowerPoint Wizard Add-in |
| pxe | PXE Boot Image |
| pxo | PicoBackup Backup Script |
| pza | PhotoSuite Album File |
| pzc | GraphPad Prism Script |
| qap | Omnis Quartz Application |
| qds | Windows Directory Query File |
| qkx | QuicKeys Action Set |
| qky | Quirky Kernel |
| qpa | QuickTime Player Addition |
| qtc | QuickTime Component File |
| qtn | Symantec Mac OS X Endpoint Protection Quaraintined File |
| qtp | QuickTime Preferences |
| qtr | QuickTime Resources |
| qua | Avira AntiVirus Quarantined File |
| qwq | OpenQwaq Auto-Launch File |