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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .PNV | Open Source | Data Files | CRiSP Harvest File | CRiSP Harvest | Open Source |
| .PO2 | Dr. Hsin H. Huang | Data Files | STABCAL Data File | STABCAL | Dr. Hsin H. Huang |
| .PO5 | Dr. Hsin H. Huang | Data Files | STABCAL File | STABCAL | Dr. Hsin H. Huang |
| .POD | Terminal Reality | Data Files | Terminal Reality Game Data File | Dragon UnPACKer | Open Source |
| .POI | Magellan Navigation | Data Files | Magellan Maestro Point Of Interest File | TomTom NAVIGATOR | TomTom International BV |
| .POK | Erik Kunze | Data Files | ZX Spectrum Emulator Poke | XZX-Pro | Erik Kunze |
| .POM | Apache Software Foundation | Data Files | Maven Build File | Maven | Apache Software Foundation |
| .PONGLIFE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .POR | IBM | Data Files | SPSS Portable File | IBM SPSS | IBM |
| .PORT | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .POS | Trimble Inc. | Data Files | Trimble Position File | GPS Pathfinder Office Software | Trimble Inc. |
| .POST | Light of Creativity, Inc. | Data Files | LIGHT File | Light Notebook | Light of Creativity, Inc. |
| .POSTSCRIPT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .POT | Microsoft Corporation | Data Files | PowerPoint Template | Microsoft PowerPoint | Microsoft Corporation |
| .POTM | Microsoft Corporation | Data Files | PowerPoint Open XML Macro-Enabled Presentation Template | Microsoft PowerPoint | Microsoft Corporation |
| .POTX | Microsoft Corporation | Data Files | PowerPoint Open XML Presentation Template | Microsoft PowerPoint | Microsoft Corporation |
| .PP | Geckonization | Data Files | Pocket Physics Sketch File | Microsoft Notepad | Microsoft Corporation |
| .PP2 | Pingman Tools | Data Files | PingPlotter Data File | PingPlotter | Pingman Tools |
| .PP3 | Objectif Lune, Inc. | Data Files | PlanetPress Suite Form File | PlanetPress Suite | Objectif Lune, Inc. |
| .PPB | Corel | Data Files | Corel WordPerfect Print Preview Button Bar File | Corel WordPerfect | Corel |
| .PPD | Adobe Systems Incorporated | Data Files | PostScript Printer Description File | Adobe PageMaker | Adobe Systems Incorporated |
| .PPF | Corel | Data Files | Picture Publisher Image File | CorelDRAW Graphics Suite | Corel |
| .PPKG | Microsoft Corporation | Data Files | Microsoft Windows Provisioning Package | Microsoft Windows | Microsoft Corporation |
| .PPM | The GIMP Development Team | Data Files | Portable Pixmap Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .PPN | Lexmark International, Inc. | Data Files | Lexmark Printer Firmware | Unknown Software | Unknown Developer |
| .PPP | Serif | Data Files | Serif PagePlus Document | PagePlus | Serif |
| .PPR | IBM | Data Files | Cognos PowerPlay Report File | Cognos PowerPlay | IBM |
| .PPS | Microsoft Corporation | Data Files | PowerPoint Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPSM | Microsoft Corporation | Data Files | PowerPoint Open XML Macro-Enabled Slide Show | Microsoft Powerpoint 2016 | Microsoft Corporation |
| .PPSX | Microsoft Corporation | Data Files | PowerPoint Open XML Slide Show | Apache OpenOffice | Apache Software Foundation |
| .PPT | Microsoft Corporation | Data Files | PowerPoint Presentation | Apache OpenOffice | Apache Software Foundation |
| .PPTM | Microsoft Corporation | Data Files | PowerPoint Open XML Macro-Enabled | Microsoft PowerPoint | Microsoft Corporation |
| .PPTX | Microsoft Corporation | Data Files | PowerPoint Open XML Presentation | Apache OpenOffice | Apache Software Foundation |
| .PPV | Microsoft Corporation | Data Files | Pocket PowerPoint Presentation | Microsoft PowerPoint | Microsoft Corporation |
| .PPX | Serif | Data Files | Serif PagePlus Template File | PagePlus | Serif |
| .PQ | Eric Fredricksen | Data Files | Progress Quest Save File | Progress Quest | Eric Fredricksen |
| .PQA | Novell, Inc. | Data Files | Query Application Data | ZENworks Suite | Novell, Inc. |
| .PQE | Kroll Ontrack | Data Files | Ontrack EasyRecovery Recovered Data File | Ontrack EasyRecovery | Kroll Ontrack |
| .PQF | Corel | Data Files | Corel Presentations Runtime Data | Corel Presentations X8 | Corel |
| .PQG | GRH Software | Data Files | RESCUE ME Os2dos File | RESCUE ME backup software | GRH Software |
| .PQO | USGS (United States Geological Survey) | Data Files | PhreeqcI Data | PhreeqcI | USGS (United States Geological Survey) |
| .PQW | Corel | Data Files | Corel Presentations Runtime Data | Corel Presentations X8 | Corel |
| .PR1 | CheckMark Inc | Data Files | CheckMark Payroll Software Employees File | CheckMark Payroll | CheckMark Inc |
| .PR2 | dBase, LLC | Data Files | dBASE IV Printer Driver | dBase | dBase, LLC |
| .PR3 | Adobe Systems Incorporated | Data Files | Adobe Persuasion V3 Presentation | Adobe Persuasion | Adobe Systems Incorporated |
| .PR4 | Software Publishing Corporation (SPC) | Data Files | Harvard Graphics Presentation | Corel Presentations X8 | Corel |
| .PR5 | GEOTOP | Data Files | MapSys Map File | MapSys | GEOTOP |
| .PRB | John C. Miller | Data Files | XyAlgebra Probabilities File | xyAlgebra | John C. Miller |
| .PRC | Adobe Systems Incorporated | Data Files | Product Representation Compact File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .PRD | SoftMaker Software | Data Files | SoftMaker Presentations Document | Softmaker Office | SoftMaker Software |
| .PRE | IBM | Data Files | Lotus Freelance Graphics File | Microsoft PowerPoint | Microsoft Corporation |
| .PREF | Unknown Developer | Data Files | Preferences File | macOS | Apple |
| .PRF | Microsoft Corporation | Data Files | Outlook Profile File | Microsoft Outlook 2016 | Microsoft Corporation |
| Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple | |
| .PRINTER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .PRISM | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PRJ | Unknown Developer | Data Files | Project File | Microsoft Visual Studio | Microsoft Corporation |
| .PRN | Various Developers | Data Files | HP PCL Printer Output | Canvas X | ACD Systems |
| .PRNX | Developer Express Inc | Data Files | XtraReports PrintingSystem Document | XtraReports | Developer Express Inc |
| .PRO4 | Renewed Vision | Data Files | ProPresenter 4 Export File | ProPresenter | Renewed Vision |
| .PROJ | Apple | Data Files | Apple NeXT Interface Builder Project | Apple Interface Builder | Apple |
| .PRP | IBM | Data Files | Rational Model Properties File | IBM Rational Rose development software | IBM |
| .PRPRESET | Adobe Systems Incorporated | Data Files | Adobe Premiere Preset | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .PRS | Software Publishing Corporation (SPC) | Data Files | Harvard Graphics Presentation | Corel Presentations X8 | Corel |
| .PRT | PTC | Data Files | Pro/ENGINEER Part File | Autodesk Fusion 360 | Autodesk, Inc. |
| .PRU | IBM | Data Files | IBM Tivoli Storage Manager Pruned Entry Data | Tivoli Storage Manager | IBM |
| .PRV | E-on Software, Inc. | Data Files | Vue Preview File | E-on Vue | E-on Software, Inc. |
| .PRX | Microsoft Corporation | Data Files | FoxPro Compiled Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .PRZ | IBM | Data Files | Freelance Graphics Presentation File | Freelance Mobile Screen Show Player | IBM |
| .PSA | Epic Games | Data Files | Unreal Engine Skeletal Animation File | Unreal Tournament | Epic Games |
| .PSD | Adobe Systems Incorporated | Data Files | Adobe Photoshop Document | Adobe Illustrator CC | Adobe Systems Incorporated |
| .PSF | Adobe Systems Incorporated | Data Files | Photoshop Proof Settings File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .PSHADER | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File | Microsoft Visual Studio | Microsoft Corporation |
| .PSL | Ericom Software | Data Files | PowerTerm Script Language File | PowerTerm InterConnect | Ericom Software |
| .PSM | Embarcadero Technologies | Data Files | Turbo Pascal Symbol Table Of IDE | Turbo Pascal | Embarcadero Technologies |
| .PSN | OptionVue Systems International | Data Files | OptionVue Portfolio Manager Positions Data | OptionVue | OptionVue Systems International |
| .PSO | NCH Software | Data Files | DreamPlan Home Design Software Data | DreamPlan Home Design Software | NCH Software |
| .PSOD | Roxio | Data Files | Roxio Easy Media Creator Album File | Roxio Easy Media Creator | Roxio |
| .PSP | Corel Corporation | Data Files | PaintShop Pro Image | Corel Painter | Corel |
| .PSPD | Sonic Solutions | Data Files | PhotoSuite 5 Project File | Roxio Creator NXT Pro 6 | Roxio |
| .PSPROJ | Broderbund | Data Files | The Print Shop Project File | The Print Shop | Broderbund |
| .PST | Microsoft Corporation | Data Files | Outlook Personal Information Store File | Microsoft Outlook Express | Microsoft Corporation |
| .PSV | Sony | Data Files | PlayStation 2 Save File | PSV Exporter | Open Source |
| .PSW | Microsoft Corporation | Data Files | Windows Password Reset Disk File | Password Reset Disk | Microsoft Corporation |
| .PT4 | Adobe Systems Incorporated | Data Files | Adobe PageMaker 4 Template | Adobe PageMaker | Adobe Systems Incorporated |
| .PTB | Sage | Data Files | Sage 50 Backup File | Sage 50 | Sage |
| .PTC | ABBYY | Data Files | Abbyy Finereader File | ABBYY FineReader | ABBYY |
| .PTD | Peninsular Technologies | Data Files | PipeTech Data File | Peninsular Technologies PipeTech | Peninsular Technologies |
| .PTE | WnSoft | Data Files | PicturesToExe Project | PicturesToExe | WnSoft |
| .PTF | Sony | Data Files | PSP Theme File | PSP Theme Toolbox | Unknown Developer |
| .PTK | Intuit, Inc. | Data Files | Quicken Online Financial Data File | Intuit Quicken | Quicken |
| .PTM | Microsoft Corporation | Data Files | MapPoint Map File | Microsoft MapPoint | Microsoft Corporation |
| .PTN | Nuance | Data Files | PaperPort Thumbnail File | Nuance PaperPort 14 | Nuance |
| .PTO | Unknown Developer | Data Files | Hugin Project File | Hugin | Open Source |
| .PTP | Avid Technology | Data Files | Pro Tools Preferences File | Avid Pro Tools | Avid Technology |
| .PTS | Avid Technology | Data Files | Pro Tools Session | Avid Pro Tools | Avid Technology |
| .PTU | NovaLogic | Data Files | Nova Logic Effects Definition File | Delta Force | NovaLogic |
| .PUB | Microsoft Corporation | Data Files | Microsoft Publisher Document | LibreOffice | The Document Foundation |
| .PUBLIC | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .PUBLISHPROJ | Microsoft Corporation | Data Files | Visual Studio Data | Microsoft Visual Studio | Microsoft Corporation |
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