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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .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 |
| .PUBXML | Microsoft Corporation | Data Files | Microsoft Visual Studio Publish Profile | Microsoft Visual Studio | Microsoft Corporation |
| .PUL | HEKA | Data Files | PATCHMASTER Pulsed Tree Data | PATCHMASTER | HEKA |
| .PUR | Idyllic Pixel | Data Files | PureRef Save File | PureRef | Idyllic Pixel |
| .PVA | Hauppauge Computer Works | Data Files | Hauppauge DVB-Software File | Hauppauge DVB-Software | Hauppauge Computer Works |
| .PVB | VirtualBoss, Inc. | Data Files | VirtualBoss PocketPC Data | VirtualBoss | VirtualBoss, Inc. |
| .PVD | Varden Development | Data Files | Polygen3D Vector Descriptor | Polygen3D | Varden Development |
| .PVF | Authentica, Inc. | Data Files | PageVault/PageRecall File | Authentica PageRecall | Authentica, Inc. |
| .PVG | Microsoft Corporation | Data Files | Encarta World Atlas Data File | Microsoft Encarta | Microsoft Corporation |
| .PVI | Canon Inc. | Data Files | Canon Picture Browser Cache Index | Unknown Software | Unknown Developer |
| .PVL | Unknown Developer | Data Files | Instalit Library | HPI Instalit | Unknown Developer |
| .PVT | Tom Jennings | Data Files | Local Fidonet Pointlist | Fidonet | Tom Jennings |
| .PVU | NOAA | Data Files | PaleoVu Paleoenvironmental Data File | PaleoVu | NOAA |
| .PVW | Outram Research Ltd | Data Files | Pronto For Windows Data View File | Pronto for Windows | Outram Research Ltd |
| .PWB | PasswordBoss, LLC | Data Files | Password Boss Data | Password Boss | PasswordBoss, LLC |
| .PWE | ACCA Software | Data Files | PriMus Exchange Document | ACCA Software PriMus-DCF | ACCA Software |
| .PWK | Gregory Braun | Data Files | Password Keeper Password Database | Password Keeper | Gregory Braun |
| .PWN | CompuPhase | Data Files | Pawn Source Code File | SA-MP Editor | Open Source |
| .PWP | Seattle FilmWorks | Data Files | PhotoWorks Image File | XnView MP | XnSoft |
| .PWX | TrainingPeaks | Data Files | PowerAgent Exported Workout Data | Poweragent | TrainingPeaks |
| .PX | Pixela Corporation | Data Files | Pixel Image File | Pixel image editor | Softonic Corporate |
| .PXA | Bartels Media GmbH | Data Files | Autotext PhraseExpress Phrase File | PhraseExpress for iOS | Bartels Media GmbH |
| .PXC | Photodex | Data Files | Photodex Cache File | Photodex ProShow | Photodex |
| .PXF | STAR Group | Data Files | Transit XV Pack Project File | Star Group Transit NXT | STAR Group |
| .PXJ | Roxio | Data Files | RecordNow Project | Roxio RecordNow Music Lab | Roxio |
| .PXK | Statistics Finland | Data Files | PX-Edit Metadata | PX-Edit | Statistics Finland |
| .PXL | Microsoft Corporation | Data Files | Pocket Excel File | NeoOffice | Planamesa Software Inc. |
| .PYI | IBM | Data Files | IBM Cognos 7 File | IBM Cognos Business Intelligence | IBM |
| .PYS | Microsoft Corporation | Data Files | Microsoft Console Based Script Host File | Microsoft Windows | Microsoft Corporation |
| .PZA | MGI Software | Data Files | PhotoSuite Album File | PhotoSuite | MGI Software |
| .PZD | CAD Zone, Inc | Data Files | Pocket Zone Drawing | Pocket Zone | CAD Zone, Inc |
| .PZH | Soft S.A. | Data Files | Presto File | WinRAR | Eugene Roshal |
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