| .P2M | Dassault Systèmes | Instellingsbestanden | PhotoWorks Appearance File | SFW PhotoWorks | Seattle Lab |
| .P3E | Adobe Systems Incorporated | Instellingsbestanden | Photoshop Repousse Settings File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .P7E | Electric Quilt | Instellingsbestanden | EQStitch 7 Project | Electric Quilt | Electric Quilt |
| .PAL | Corel | Instellingsbestanden | Painter Custom Palettes File | Corel Painter | Corel |
| .PAN | ProVUE Development | Instellingsbestanden | Panorama Database File | ProVUE Development Panorama | ProVUE Development |
| .PB | Fantaisie Software | Instellingsbestanden | PureBasic Source File | PureBasic | Fantaisie Software |
| .PB2 | Orinda Software Ltd | Instellingsbestanden | OrindaBuild Configuration File | OrindaBuild | Orinda Software Ltd |
| .PBP | Sony | Instellingsbestanden | PSP Firmware Update File | PBP Unpacker | Unknown Developer |
| .PBS | Corel | Instellingsbestanden | PaintShop Pro Brush Strokes | PaintShop Pro | Corel |
| .PBV | Corel | Instellingsbestanden | Paint Shop Pro Bevel Preset | PaintShop Pro | Corel |
| .PBZ | Google | Instellingsbestanden | Google Picasa Button ZIP Archive | Google Picasa | Google |
| .PC2 | Autodesk, Inc. | Instellingsbestanden | AutoCAD Plotter Configuration File | Autodesk AutoCAD | Autodesk, Inc. |
| .PC3 | Autodesk, Inc. | Instellingsbestanden | AutoCAD Plotter Configuration File | Autodesk AutoCAD | Autodesk, Inc. |
| .PCN | Corel | Instellingsbestanden | Corel Paint Shop Pro Contour Preset | PaintShop Pro | Corel |
| .PCP | Microsoft Corporation | Instellingsbestanden | Windows Installer Patch Creation Properties File | Microsoft Windows SDK | Microsoft Corporation |
| .PDF | Adobe Systems Incorporated | Instellingsbestanden | Portable Document Format File | LibreOffice | The Document Foundation |
| .PDP | Palo Alto Software | Instellingsbestanden | Palo Alto Software Plan Component File | Business Plan Pro | Palo Alto Software |
| .PEN | Corel | Instellingsbestanden | Paint Shop Pro Pen Preset File | PaintShop Pro | Corel |
| .PERFMONCFG | Microsoft Corporation | Instellingsbestanden | Performance Monitor Configuration File | Windows Performance Monitor | Microsoft Corporation |
| .PFK | Jeffrey C. Johnson | Instellingsbestanden | XTree Programmable Function Keys | XTree | Jeffrey C. Johnson |
| .PFS | Antonio Da Cruz | Instellingsbestanden | PhotoFiltre Studio Saved Selection File | PhotoFiltre | Antonio Da Cruz |
| .PGP | Autodesk, Inc. | Instellingsbestanden | AutoCAD Program Parameters File | Microsoft Notepad | Microsoft Corporation |
| .PH | Larry Wall | Instellingsbestanden | Perl Header File | Perl | Larry Wall |
| .PHB | Motorola | Instellingsbestanden | Motorola Phone Book File | Motorola Phone Tools | Avanquest Software |
| .PHL | Amazon | Instellingsbestanden | Kindle Popular Highlights File | Microsoft Notepad | Microsoft Corporation |
| .PIE | Carl Kenner | Instellingsbestanden | GlovePIE Controller Script | GlovePIE | Softonic Corporate |
| .PIO | Avid Technology | Instellingsbestanden | Pro Tools I/O Settings File | Avid Pro Tools | Avid Technology |
| .PIP | Microsoft Corporation | Instellingsbestanden | Office Personalized Settings File | Microsoft Excel | Microsoft Corporation |
| .PIW | PixAround | Instellingsbestanden | PI ProcessBook Display Definition File | PixMaker | PixAround |
| .PKG | Apple | Instellingsbestanden | Apple MacOS Installer Package | macOS | Apple |
| .PKGDEF | Microsoft Corporation | Instellingsbestanden | Microsoft Visual Studio Shell Data | Microsoft Visual Studio | Microsoft Corporation |
| .PL | Larry Wall | Instellingsbestanden | Perl Source Code | Microsoft Notepad | Microsoft Corporation |
| .PLB | Microsoft Corporation | Instellingsbestanden | Microsoft Robotics Developer Studio Playback Data | Microsoft Robotics Developer Studio | Microsoft Corporation |
| .PLG | Microsoft Corporation | Instellingsbestanden | Visual Studio Build Log File | Microsoft Visual Studio | Microsoft Corporation |
| .PLIST | Apple | Instellingsbestanden | Property List XML File | Microsoft Notepad | Microsoft Corporation |
| .PLS | Various Developers | Instellingsbestanden | Audio Playlist | VLC Media Player | VideoLAN |
| .PM5 | Adobe Systems Incorporated | Instellingsbestanden | PageMaker 5.0 Document | Adobe PageMaker | Adobe Systems Incorporated |
| .PM6 | Adobe Systems Incorporated | Instellingsbestanden | PageMaker 6.0 Document | Adobe InDesign | Adobe Systems Incorporated |
| .PMC | David Harris | Instellingsbestanden | Pegasus Mail Filter Rule Files | Pegasus Mail | David Harris |
| .PMJ | David Harris | Instellingsbestanden | Pegasus Mail Configuration File | Pegasus Mail | David Harris |
| .PMK | David Harris | Instellingsbestanden | Pegasus Mail Keyboard Settings | Pegasus Mail | David Harris |
| .PML | Microsoft Corporation | Instellingsbestanden | Process Monitor Log File | Process Monitor | Microsoft Corporation |
| .PMP | Autodesk, Inc. | Instellingsbestanden | AutoCAD Plot Model Parameter File | Autodesk AutoCAD | Autodesk, Inc. |
| .PNP | David Harris | Instellingsbestanden | Pegasus Mail POP3 Filter Rules | Pegasus Mail | David Harris |
| .POLICY | Oracle Corporation | Instellingsbestanden | Java Policy Implementation File | Java Virtual Machine | Sun Microsystems |
| .POW | Microsoft Corporation | Instellingsbestanden | Microsoft Windows Power Schema | Microsoft Windows | Microsoft Corporation |
| .PPG | Microsoft Corporation | Instellingsbestanden | Microsoft PowerPoint Presentation | Microsoft PowerPoint | Microsoft Corporation |
| .PPP | Serif | Instellingsbestanden | Serif PagePlus Document | PagePlus | Serif |
| .PPW | Corel | Instellingsbestanden | Micrografx Picture Publisher Wizard File | Micrografx Picture Publisher | Corel |
| .PQ | Eric Fredricksen | Instellingsbestanden | Progress Quest Save File | Progress Quest | Eric Fredricksen |
| .PQZ | Mystic Fractal | Instellingsbestanden | QuaSZ Palette Data | QuaSZ | Mystic Fractal |
| .PR | Source Dynamics, Inc. | Instellingsbestanden | Source Insight Project | Source Insight | Source Dynamics, Inc. |
| .PR3 | Adobe Systems Incorporated | Instellingsbestanden | Adobe Persuasion V3 Presentation | Adobe Persuasion | Adobe Systems Incorporated |
| .PRA | SofTech, Inc. | Instellingsbestanden | CADRA Design Drafting Software Data | CADRA | SofTech, Inc. |
| .PRB | John C. Miller | Instellingsbestanden | XyAlgebra Probabilities File | xyAlgebra | John C. Miller |
| .PREF | Unknown Developer | Instellingsbestanden | Preferences File | macOS | Apple |
| .PRF | Microsoft Corporation | Instellingsbestanden | Outlook Profile File | Microsoft Outlook 2016 | Microsoft Corporation |
| .PRM | Unknown Developer | Instellingsbestanden | Parameter File | GSAS | National Institute of Standards and Technology (NIST) |
| .PROFILE | GNU Operating System | Instellingsbestanden | Bash Shell Profile | MacroMates TextMate | MacroMates |
| .PROPERTIES | Mojang | Instellingsbestanden | Minecraft Properties File | Microsoft Notepad | Microsoft Corporation |
| .PROPS | Microsoft Corporation | Instellingsbestanden | Microsoft Visual Studio Property Sheet | Microsoft Visual Studio | Microsoft Corporation |
| .PROVXML | Microsoft Corporation | Instellingsbestanden | Microsoft Windows Provisioning XML Data | Windows Mobile | Microsoft Corporation |
| .PRP | IBM | Instellingsbestanden | Rational Model Properties File | IBM Rational Rose development software | IBM |
| .PRS | Software Publishing Corporation (SPC) | Instellingsbestanden | Harvard Graphics Presentation | Corel Presentations X8 | Corel |
| .PRT | PTC | Instellingsbestanden | Pro/ENGINEER Part File | Autodesk Fusion 360 | Autodesk, Inc. |
| .PRX | Microsoft Corporation | Instellingsbestanden | FoxPro Compiled Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .PS1XML | Microsoft Corporation | Instellingsbestanden | Windows PowerShell Display Configuration File | Microsoft Windows PowerShell | Microsoft Corporation |
| .PSC1 | Microsoft Corporation | Instellingsbestanden | Windows PowerShell Console File | Microsoft Windows PowerShell | Microsoft Corporation |
| .PSC2 | Microsoft Corporation | Instellingsbestanden | Windows PowerShell Console File | Microsoft Windows PowerShell | Microsoft Corporation |
| .PSF | Adobe Systems Incorporated | Instellingsbestanden | Photoshop Proof Settings File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .PSP | Corel Corporation | Instellingsbestanden | PaintShop Pro Image | Corel Painter | Corel |
| .PSPROJ | Broderbund | Instellingsbestanden | The Print Shop Project File | The Print Shop | Broderbund |
| .PSY | Open Source | Instellingsbestanden | Psycle Song File | Psycle | Open Source |
| .PTF | Sony | Instellingsbestanden | PSP Theme File | PSP Theme Toolbox | Unknown Developer |
| .PTG | Pearson | Instellingsbestanden | PowerTeacher Gradebook Configuration File | PowerTeacher Gradebook | Pearson |
| .PTP | Avid Technology | Instellingsbestanden | Pro Tools Preferences File | Avid Pro Tools | Avid Technology |
| .PVS | Parallels | Instellingsbestanden | Parallels Desktop Configuration File | VMware vCenter Converter | VMware |
| .PVX | Kitware, Inc. | Instellingsbestanden | ParaView XML Configuration File | ParaView | Open Source |
| .PWS | Corel | Instellingsbestanden | Painter Workspace File | Corel Painter | Corel |
| .PWT | Autodesk, Inc. | Instellingsbestanden | AutoCAD Publish To Web Template | Autodesk AutoCAD | Autodesk, Inc. |
| .PXB | The Pixelmator Team | Instellingsbestanden | Pixelmator Brush File | Pixelmator | The Pixelmator Team |
| .PXG | The Pixelmator Team | Instellingsbestanden | Pixelmator Gradient File | Pixelmator | The Pixelmator Team |
| .PXS | The Pixelmator Team | Instellingsbestanden | Pixelmator Shape File | Pixelmator | The Pixelmator Team |
| .PZP | Application Techniques Inc. | Instellingsbestanden | Pizazz Plus Palette Settings File | Pizazz | Application Techniques Inc. |
| .PZS | Sonic Solutions | Instellingsbestanden | PhotoSuite Slide Show File | Roxio Creator NXT Pro 6 | Roxio |
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