| .P5X | Microsoft Corporation | Systémové soubory | Microsoft Windows System Data | Microsoft Windows | Microsoft Corporation |
| .PANIC | Open Source | Systémové soubory | Kernel Panic File | Notepad++ | Don Ho |
| .PAT | Autodesk, Inc. | Systémové soubory | AutoCAD Hatch Pattern File | Autodesk AutoCAD | Autodesk, Inc. |
| .PBD | EaseUS | Systémové soubory | EaseUS Todo Backup Backup File | EaseUS Todo Backup | EaseUS |
| .PCF | Blackstrip Studios | Systémové soubory | PaintCAD Font | PaintCAD | Blackstrip Studios |
| .PCI | Microsoft Corporation | Systémové soubory | PCI Miniport Data | Microsoft Windows | Microsoft Corporation |
| .PCK | Microsoft Corporation | Systémové soubory | System Center Configuration Manager Package File | Microsoft system center configuration manager | Microsoft Corporation |
| .PD0 | SonTek | Systémové soubory | SonTek Firmware File | Unknown Software | Unknown Developer |
| .PDL | PDL Developerment Team | Systémové soubory | Perl Data Language File | perldl | Open Source |
| .PDR | Microsoft Corporation | Systémové soubory | Windows Port Driver | Windows Control Panel | Microsoft Corporation |
| .PFX | Various Developers | Systémové soubory | PKCS #12 Certificate File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .PIT | Samsung Electronics | Systémové soubory | Samsung Phone Firmware File | Google Android | Google |
| .PLK | Advanced Micro Devices, Inc. | Systémové soubory | AMD ATI Radeon Video Driver | ATI Multimedia Center | Advanced Micro Devices, Inc. |
| .PNF | Microsoft Corporation | Systémové soubory | Precompiled INF File | Microsoft Windows | Microsoft Corporation |
| .POL | Microsoft Corporation | Systémové soubory | Windows Policy File | Registry.Pol Viewer Utility | SDM Software |
| .PPD | Adobe Systems Incorporated | Systémové soubory | PostScript Printer Description File | Adobe PageMaker | Adobe Systems Incorporated |
| .PPM | The GIMP Development Team | Systémové soubory | Portable Pixmap Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .PRD | SoftMaker Software | Systémové soubory | SoftMaker Presentations Document | Softmaker Office | SoftMaker Software |
| .PREFPANE | Apple | Systémové soubory | Mac OS X System Preference Pane | Apple OS X | Apple |
| .PRF | Microsoft Corporation | Systémové soubory | Outlook Profile File | Microsoft Outlook 2016 | Microsoft Corporation |
| .PRINTEREXPORT | Microsoft Corporation | Systémové soubory | Windows Printer Migration File | Microsoft Windows 7 | Microsoft Corporation |
| .PROFILE | GNU Operating System | Systémové soubory | Bash Shell Profile | MacroMates TextMate | MacroMates |
| .PROP | Google | Systémové soubory | Android Build Properties File | Google Android | Google |
| .PRS | Software Publishing Corporation (SPC) | Systémové soubory | Harvard Graphics Presentation | Corel Presentations X8 | Corel |
| .PRT | PTC | Systémové soubory | Pro/ENGINEER Part File | Autodesk Fusion 360 | Autodesk, Inc. |
| .PS2 | Datel | Systémové soubory | Sharkport Saved Game File | PS2 Save Builder | Interscape |
| .PSSC | Microsoft Corporation | Systémové soubory | Windows PowerShell Session Configuration File | Microsoft Windows | Microsoft Corporation |
| .PWL | Microsoft Corporation | Systémové soubory | Windows Password List | Proactive System Password Recovery | ElcomSoft |
| .PXE | Open Source | Systémové soubory | Linux, Unix Network Bootable Image | Linux | Open Source |
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