| .P | Python Software Foundation | Pliki z wtyczkami | Python Pickle File | Python pickle | Python Software Foundation |
| .PBA | Oracle Corporation | Pliki z wtyczkami | OpenOffice.org Basic Protected Module File | Apache OpenOffice | Apache Software Foundation |
| .PE | Microsoft Corporation | Pliki z wtyczkami | Portable Executable File | Microsoft Windows | Microsoft Corporation |
| .PFL | PlotSoft | Pliki z wtyczkami | PDFill Project File | PlotSoft PDFill | PlotSoft |
| .PIM | Avid Technology | Pliki z wtyczkami | Pro Tools Controller Plug-in Mappings File | Avid Pro Tools | Avid Technology |
| .PKP | Microsoft Corporation | Pliki z wtyczkami | Visual Studio Packaging Project | Microsoft Visual Studio | Microsoft Corporation |
| .PL1 | Broderbund | Pliki z wtyczkami | 3D Home Architect Room Plan | 3D Home Architect | Broderbund |
| .PLG | Microsoft Corporation | Pliki z wtyczkami | Visual Studio Build Log File | Microsoft Visual Studio | Microsoft Corporation |
| .PLUGIN | Adobe Systems Incorporated | Pliki z wtyczkami | Adobe Photoshop Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .PLW | Hex-Rays | Pliki z wtyczkami | 32-bit Windows IDA Plugin Module | Hex-Rays IDA | Hex-Rays |
| .PLX | ActiveState | Pliki z wtyczkami | Perl Executable File | BBEdit | Bare Bones Software |
| .PPA | Microsoft Corporation | Pliki z wtyczkami | PowerPoint Add-in | Microsoft PowerPoint | Microsoft Corporation |
| .PPAM | Microsoft Corporation | Pliki z wtyczkami | PowerPoint 2007 Add-In | Microsoft Powerpoint 2016 | Microsoft Corporation |
| .PPM | The GIMP Development Team | Pliki z wtyczkami | Portable Pixmap Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .PRM | Unknown Developer | Pliki z wtyczkami | Parameter File | GSAS | National Institute of Standards and Technology (NIST) |
| .PSET | Adobe Systems Incorporated | Pliki z wtyczkami | Adobe InDesign Plug-in Set File | Adobe InDesign | Adobe Systems Incorporated |
z 1 
