| .PHA | Parametric Technology Corporation | Gegevensbestanden | PTC Creo Data File | Pro/ENGINEER | PTC |
| .PHB | Motorola | Gegevensbestanden | Motorola Phone Book File | Motorola Phone Tools | Avanquest Software |
| .PHD | CyberLink | Gegevensbestanden | PhotoDirector Project File | PhotoDirector | CyberLink |
| .PHL | Amazon | Gegevensbestanden | Kindle Popular Highlights File | Microsoft Notepad | Microsoft Corporation |
| .PHP | Panic | Gegevensbestanden | PHP Source Code File | Microsoft Notepad | Microsoft Corporation |
| .PHR | Adobe Systems Incorporated | Gegevensbestanden | RoboHelp Phrase List | Adobe RoboHelp | Adobe Systems Incorporated |
| .PHS | Open Source | Gegevensbestanden | XtalView Phase File | XtalView | Open Source |
| .PH_ | Unknown Developer | Gegevensbestanden | C Poet Compressed Disk1 File | Unknown Software | Unknown Developer |
| .PI | 10101 Software | Gegevensbestanden | Pi Calculation Data File | iPi Software | 10101 Software |
| .PIA | PanaVue Inc. | Gegevensbestanden | PanaVue ImageAssembler Project | PanaVue ImageAssembler | PanaVue Inc. |
| .PIB | Applied Programming Technology | Gegevensbestanden | Platform Independent Binary | PibTool | Applied Programming Technology |
| .PII | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PIL | M Dialysis AB | Gegevensbestanden | CMA Microdialysis Trend Data | LABpilot | M Dialysis AB |
| .PILE | Piletest.com Limited | Gegevensbestanden | CHUM Test Results | CHUM | Piletest.com Limited |
| .PIQ | Queensgate Systems | Gegevensbestanden | Piped Technology Information Query | Piped | Queensgate Systems |
| .PIQT | Apple | Gegevensbestanden | Apple QuickTime Still File | Apple QuickTime Player | Apple |
| .PIV | Peter Bone | Gegevensbestanden | Pivot Stickfigure Animation | Pivot Animator (Pivot Stickfigure Animator) | Peter Bone |
| .PIZ | Winrar | Gegevensbestanden | Zipped File | 7-Zip | Igor Pavlov |
| .PJD | Extensis | Gegevensbestanden | Portfolio Exported Categories File | Portfolio | Extensis |
| .PJF | Flagship Software Ltd. | Gegevensbestanden | iAddress Postal Job File | iAddress | Flagship Software Ltd. |
| .PJL | Thomson Reuters Corporation | Gegevensbestanden | ProCite Term Lists And Journal Title Lists | ProCite | Thomson Reuters Corporation |
| .PJT | Golden Software LLC | Gegevensbestanden | Didger Project File | Golden Software Didger | Golden Software LLC |
| .PJW | IDEC Corporation | Gegevensbestanden | WindLDR 6 Project Settings | WindLDR | IDEC Corporation |
| .PKA | Cisco Systems | Gegevensbestanden | Packet Tracer Activity File | Packet Tracer | Cisco Systems |
| .PKG | Apple | Gegevensbestanden | Apple MacOS Installer Package | macOS | Apple |
| .PKN | Microsoft Corporation | Gegevensbestanden | Systems Management Server (SMS) Package Creation Notification | Microsoft Systems Management Server | Microsoft Corporation |
| .PKS | Oracle Corporation | Gegevensbestanden | Oracle Package Spec File | Microsoft Notepad | Microsoft Corporation |
| .PKT | Cisco Systems | Gegevensbestanden | Packet Tracer Network Simulation Model | Packet Tracer | Cisco Systems |
| .PKW | Vero Software | Gegevensbestanden | Cabnetware File | Cabnetware | Vero Software |
| .PKX | IBM | Gegevensbestanden | Rational XDE Data | Rational Rose | IBM |
| .PL3 | Harvard Graphics | Gegevensbestanden | Harvard Graphics Chart Palette | Harvard Graphics ChartXL | Harvard Graphics |
| .PLAN | KDE | Gegevensbestanden | Calligra Plan Document | Calligra Suite | KDE |
| .PLAYSOUND | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PLB | Microsoft Corporation | Gegevensbestanden | Microsoft Robotics Developer Studio Playback Data | Microsoft Robotics Developer Studio | Microsoft Corporation |
| .PLC | Sunbelt | Gegevensbestanden | PL/B Source File | Sunbelt Visual PL/B | Sunbelt |
| .PLG | Microsoft Corporation | Gegevensbestanden | Visual Studio Build Log File | Microsoft Visual Studio | Microsoft Corporation |
| .PLK | Advanced Micro Devices, Inc. | Gegevensbestanden | AMD ATI Radeon Video Driver | ATI Multimedia Center | Advanced Micro Devices, Inc. |
| .PLN | Microsoft Corporation | Gegevensbestanden | Flight Simulator Flight Plan | Microsoft Flight Simulator | Microsoft Corporation |
| .PLOTTER | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PLS | Various Developers | Gegevensbestanden | Audio Playlist | VLC Media Player | VideoLAN |
| .PLT | Tecplot, Inc | Gegevensbestanden | Tecplot Binary Data File | Tecplot 360 | Tecplot, Inc |
| .PLUS | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PLV | Magix Software GmbH | Gegevensbestanden | Digital Foto Maker Data | MAGIX Digital Foto Maker | Magix Software GmbH |
| .PLW | Hex-Rays | Gegevensbestanden | 32-bit Windows IDA Plugin Module | Hex-Rays IDA | Hex-Rays |
| .PM0 | David Harris | Gegevensbestanden | Pegasus Mail Data | Pegasus Mail | David Harris |
| .PM2 | David Harris | Gegevensbestanden | Pegasus Mail UID Information | Pegasus Mail | David Harris |
| .PM3 | Crouzet | Gegevensbestanden | Crouzet Logic Software M3 File | Crouzet M3 Soft | Crouzet |
| .PM7 | Adobe Systems Incorporated | Gegevensbestanden | Adobe PageMaker 7 Document | Adobe PageMaker | Adobe Systems Incorporated |
| .PMA | David Harris | Gegevensbestanden | Pegasus Mail Data Archive File | Pegasus Mail | David Harris |
| .PMAP | JKRB Software | Gegevensbestanden | Pocket Mindmap Mindmap File | Pocket Mindmap | JKRB Software |
| .PMC | David Harris | Gegevensbestanden | Pegasus Mail Filter Rule Files | Pegasus Mail | David Harris |
| .PME | BlackBerry | Gegevensbestanden | Plazmic Media Engine File | Plazmic CDM | BlackBerry |
| .PMH | David Harris | Gegevensbestanden | Pegasus Mail Phonemic Homonym Dictionary | Pegasus Mail | David Harris |
| .PMK | David Harris | Gegevensbestanden | Pegasus Mail Keyboard Settings | Pegasus Mail | David Harris |
| .PML | Microsoft Corporation | Gegevensbestanden | Process Monitor Log File | Process Monitor | Microsoft Corporation |
| .PMM | Yu Higuchi | Gegevensbestanden | MikuMikuDance PolygonMovieMaker File | MikuMikuDance | Yu Higuchi |
| .PMO | Broderbund | Gegevensbestanden | Print Meta Object File | Broderbund PrintMaster v7 Platinum | Broderbund |
| .PMP | Autodesk, Inc. | Gegevensbestanden | AutoCAD Plot Model Parameter File | Autodesk AutoCAD | Autodesk, Inc. |
| .PMR | Avid Technology | Gegevensbestanden | Avid Persisent Media Record File | Avid Media Composer | Avid Technology |
| .PMS | David Harris | Gegevensbestanden | Pegasus Mail Data | Pegasus Mail | David Harris |
| .PMT | Adobe Systems Incorporated | Gegevensbestanden | PageMaker Template File | Adobe InDesign | Adobe Systems Incorporated |
| .PMU | David Harris | Gegevensbestanden | Pegasus Mail Keyboard Macro | Pegasus Mail | David Harris |
| .PMW | David Harris | Gegevensbestanden | Pegasus Mail Outgoing Draft Message | Pegasus Mail | David Harris |
| .PND | DATAIR | Gegevensbestanden | DATAIR Pension System Pending Data | DATAIR Pension Reporter | DATAIR |
| .PNL | Missler Software | Gegevensbestanden | TopSolid Nesting Module | TopSolid | Missler Software |
| .PNS | SourceForge | Gegevensbestanden | PNG Stereo Image | 3D Vision Photo Viewer | NVIDIA |
| .PNT | Apple | Gegevensbestanden | MacPaint File | MacPaint | Apple |
| .PNV | Open Source | Gegevensbestanden | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .PO2 | Dr. Hsin H. Huang | Gegevensbestanden | STABCAL Data File | STABCAL | Dr. Hsin H. Huang |
| .PO5 | Dr. Hsin H. Huang | Gegevensbestanden | STABCAL File | STABCAL | Dr. Hsin H. Huang |
| .POD | Terminal Reality | Gegevensbestanden | Terminal Reality Game Data File | Dragon UnPACKer | Open Source |
| .POI | Magellan Navigation | Gegevensbestanden | Magellan Maestro Point Of Interest File | TomTom NAVIGATOR | TomTom International BV |
| .POK | Erik Kunze | Gegevensbestanden | ZX Spectrum Emulator Poke | XZX-Pro | Erik Kunze |
| .POM | Apache Software Foundation | Gegevensbestanden | Maven Build File | Maven | Apache Software Foundation |
| .PONGLIFE | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .POR | IBM | Gegevensbestanden | SPSS Portable File | IBM SPSS | IBM |
| .PORT | Unknown Developer | Gegevensbestanden | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .POS | Trimble Inc. | Gegevensbestanden | Trimble Position File | GPS Pathfinder Office Software | Trimble Inc. |
| .POST | Light of Creativity, Inc. | Gegevensbestanden | LIGHT File | Light Notebook | Light of Creativity, Inc. |
| .POSTSCRIPT | Apple | Gegevensbestanden | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .POT | Microsoft Corporation | Gegevensbestanden | PowerPoint Template | Microsoft PowerPoint | Microsoft Corporation |
| .POTM | Microsoft Corporation | Gegevensbestanden | PowerPoint Open XML Macro-Enabled Presentation Template | Microsoft PowerPoint | Microsoft Corporation |
| .POTX | Microsoft Corporation | Gegevensbestanden | PowerPoint Open XML Presentation Template | Microsoft PowerPoint | Microsoft Corporation |
| .PP | Geckonization | Gegevensbestanden | Pocket Physics Sketch File | Microsoft Notepad | Microsoft Corporation |
| .PP2 | Pingman Tools | Gegevensbestanden | PingPlotter Data File | PingPlotter | Pingman Tools |
| .PP3 | Objectif Lune, Inc. | Gegevensbestanden | PlanetPress Suite Form File | PlanetPress Suite | Objectif Lune, Inc. |
| .PPB | Corel | Gegevensbestanden | Corel WordPerfect Print Preview Button Bar File | Corel WordPerfect | Corel |
| .PPD | Adobe Systems Incorporated | Gegevensbestanden | PostScript Printer Description File | Adobe PageMaker | Adobe Systems Incorporated |
| .PPF | Corel | Gegevensbestanden | Picture Publisher Image File | CorelDRAW Graphics Suite | Corel |
| .PPKG | Microsoft Corporation | Gegevensbestanden | Microsoft Windows Provisioning Package | Microsoft Windows | Microsoft Corporation |
| .PPM | The GIMP Development Team | Gegevensbestanden | Portable Pixmap Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .PPN | Lexmark International, Inc. | Gegevensbestanden | Lexmark Printer Firmware | Unknown Software | Unknown Developer |
| .PPP | Serif | Gegevensbestanden | Serif PagePlus Document | PagePlus | Serif |
| .PPR | IBM | Gegevensbestanden | Cognos PowerPlay Report File | Cognos PowerPlay | IBM |
| .PPS | Microsoft Corporation | Gegevensbestanden | PowerPoint Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPSM | Microsoft Corporation | Gegevensbestanden | PowerPoint Open XML Macro-Enabled Slide Show | Microsoft Powerpoint 2016 | Microsoft Corporation |
| .PPSX | Microsoft Corporation | Gegevensbestanden | PowerPoint Open XML Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPT | Microsoft Corporation | Gegevensbestanden | PowerPoint Presentation | Apache OpenOffice | Apache Software Foundation |
| .PPTM | Microsoft Corporation | Gegevensbestanden | PowerPoint Open XML Macro-Enabled | Microsoft PowerPoint | Microsoft Corporation |
| .PPTX | Microsoft Corporation | Gegevensbestanden | PowerPoint Open XML Presentation | Apache OpenOffice | Apache Software Foundation |
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