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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .P00 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P01 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P10 | Open Source | Uncommon Files | Certificate Request File | Apple Mail | Apple |
| .P11 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P15 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P16 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P1C | IBM | Uncommon Files | IBM Voice Type Language Newuser File | IBM Embedded ViaVoice | IBM |
| .P1I | IBM | Uncommon Files | IBM Voice Type Language Newuser File | IBM Embedded ViaVoice | IBM |
| .P2P | Microsoft Corporation | Uncommon Files | FolderShare Placeholder File | FolderShare | Microsoft Corporation |
| .P32 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P34 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P35 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | HERE Maps | HERE |
| .P40 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .P50 | Unknown Developer | Uncommon Files | The Player Module | The Player | Unknown Developer |
| .P56 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .P61 | Commodore International | Uncommon Files | 6.1a Module File | The Player | Unknown Developer |
| .PAA | FamilySearch | Uncommon Files | Personal Ancestral File Data | PAF Software | FamilySearch |
| .PAD | Swiftpage, Inc. | Uncommon Files | ACT! Database Pointer File | Act! | Swiftpage, Inc. |
| .PAGE12 | DigiSoft Innovations | Uncommon Files | An Unknown Apple II File | Golden Orchard | DigiSoft Innovations |
| .PAINT | Apple | Uncommon Files | MacPaint Bitmap Graphics | MacPaint | Apple |
| .PANDO | Pando Networks | Uncommon Files | Pando File | Pando | Pando Networks |
| .PAP | tshsoft | Uncommon Files | PanoramaStudio Project File | PanoramaStudio | tshsoft |
| .PARA | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PARAMFILE | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PART | Mozilla | Uncommon Files | Partially Downloaded File | Mozilla Firefox | Mozilla |
| .PARTIAL | Microsoft Corporation | Uncommon Files | Internet Explorer Partially Downloaded File | Internet Explorer | Microsoft Corporation |
| .PAU | Steve Sneed | Uncommon Files | OzWin CompuServe E-mail/Forum Access Paused Message File | OzWin | Steve Sneed |
| .PC9 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PC?= | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PDC | Locklizard | Uncommon Files | Lizard Safeguard Secure PDF File | LockLizard Secure PDF Viewer | Locklizard |
| .PDFCEIBAL | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PDY | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PD_ | Unknown Developer | Uncommon Files | Visc15 Images Setup File | Unknown Software | Unknown Developer |
| .PEBPRJ | Bitsum Technologies | Uncommon Files | PEBundle File | PEBundle | Bitsum Technologies |
| .PENIS | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PEP | Office Work Software, LLC. | Uncommon Files | TurboProject Project File | TurboProject Standard | Office Work Software, LLC. |
| .PES | Brother International Corporation | Uncommon Files | Brother Embroidery Format | Embroidermodder 2 | Open Source |
| .PFR | Corel Corporation | Uncommon Files | Corel PaintShop Photo Pro Frame Data | PaintShop Pro | Corel |
| .PFT | Corel | Uncommon Files | Corel WordPerfect Temporary Data | Corel WordPerfect | Corel |
| .PGP | Autodesk, Inc. | Uncommon Files | AutoCAD Program Parameters File | Microsoft Notepad | Microsoft Corporation |
| .PG_ | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PHPUSERNAM | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PID | Open Source | Uncommon Files | Process ID File | Apple TextEdit | Apple |
| .PJG | Matthias Stirner | Uncommon Files | PackJPG Lossless JPEG Compression File | packJPG | Matthias Stirner |
| .PJRPD | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PKG | Apple | Uncommon Files | Apple MacOS Installer Package | macOS | Apple |
| .PKPAK | Unknown Developer | Uncommon Files | Archive File | Unknown Software | Unknown Developer |
| .PKPASS | Apple | Uncommon Files | Passbook Pass File | Apple Passbook | Apple |
| .PLACEHOLDEREXTENSION | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PLF | Papyrus Services | Uncommon Files | Papyrus License File | Papyrus II | Papyrus Services |
| .PMA | David Harris | Uncommon Files | Pegasus Mail Data Archive File | Pegasus Mail | David Harris |
| .PNT | Apple | Uncommon Files | MacPaint File | MacPaint | Apple |
| .POM | Apache Software Foundation | Uncommon Files | Maven Build File | Maven | Apache Software Foundation |
| .POO | Open Source | Uncommon Files | Commodore C64 Machine Code | CCS64 | Open Source |
| .POWER | DigiSoft Innovations | Uncommon Files | Goo Picture Library File | Golden Orchard | DigiSoft Innovations |
| .PP1 | Open Source | Uncommon Files | Free Pascal Compiled Unit | Free Pascal | Open Source |
| .PP3 | Objectif Lune, Inc. | Uncommon Files | PlanetPress Suite Form File | PlanetPress Suite | Objectif Lune, Inc. |
| .PPC | Garmin | Uncommon Files | XMap Flight Plan Statistic File | XMap | Garmin |
| .PPF | Corel | Uncommon Files | Picture Publisher Image File | CorelDRAW Graphics Suite | Corel |
| .PPK | Simon Tatham | Uncommon Files | PuTTY Private Key File | PuTTY | Simon Tatham |
| .PPO | CA Technologies | Uncommon Files | CA Clipper Preprocessor Output | CA-Clipper | CA Technologies |
| .PPT- | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PPTXML | Microsoft Corporation | Uncommon Files | Microsoft Powerpoint XML Presentation File | Microsoft PowerPoint | Microsoft Corporation |
| .PPVA | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PQN | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PROG | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PROJ | Apple | Uncommon Files | Apple NeXT Interface Builder Project | Apple Interface Builder | Apple |
| .PRS | Software Publishing Corporation (SPC) | Uncommon Files | Harvard Graphics Presentation | Corel Presentations X8 | Corel |
| .PRUI | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PSF | Adobe Systems Incorporated | Uncommon Files | Photoshop Proof Settings File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .PSI | SAPIEN Technologies | Uncommon Files | PrimalScript Online Help Shortcut | PrimalScript | SAPIEN Technologies |
| .PSM | Embarcadero Technologies | Uncommon Files | Turbo Pascal Symbol Table Of IDE | Turbo Pascal | Embarcadero Technologies |
| .PSS | Autodesk, Inc. | Uncommon Files | AutoCAD Plot Stamp Settings File | Autodesk AutoCAD | Autodesk, Inc. |
| .PSW | Microsoft Corporation | Uncommon Files | Windows Password Reset Disk File | Password Reset Disk | Microsoft Corporation |
| .PT3 | Harvard Graphics | Uncommon Files | Harvard Device Driver File | Harvard Graphics ChartXL | Harvard Graphics |
| .PTC | ABBYY | Uncommon Files | Abbyy Finereader File | ABBYY FineReader | ABBYY |
| .PTH | 4D, Inc | Uncommon Files | 4D Path Document | 4D | 4D, Inc |
| .PTN | Nuance | Uncommon Files | PaperPort Thumbnail File | Nuance PaperPort 14 | Nuance |
| .PTR | TrendyFlash.com | Uncommon Files | Flash Intro Project File | Trendy Flash Intro Builder | TrendyFlash.com |
| .PUZZLE | Unknown Developer | Uncommon Files | X11 Puzzle File | Unknown Software | Unknown Developer |
| .PVM | Parallels | Uncommon Files | Parallels Virtual Machine | VMware Fusion | VMware |
| .PVP | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PWT | Autodesk, Inc. | Uncommon Files | AutoCAD Publish To Web Template | Autodesk AutoCAD | Autodesk, Inc. |
| .PXI | Plextor | Uncommon Files | PlexTools Disk Image File | IsoBuster | Smart Projects |
| .PXN | Open Source | Uncommon Files | PictureWorks PhotoEnhancer Image | Darktable | Open Source |
| .PXT | Microsoft Corporation | Uncommon Files | Microsoft Pocket Excel Template | Microsoft Excel Mobile | Microsoft Corporation |
| .PXY | Adtollo | Uncommon Files | Topocad File | Topocad | Adtollo |
| .PY1 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PYB | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PYS | Microsoft Corporation | Uncommon Files | Microsoft Console Based Script Host File | Microsoft Windows | Microsoft Corporation |
| .PZX | Application Techniques Inc. | Uncommon Files | Pizazz Plus Swap File | Pizazz | Application Techniques Inc. |
| .P_G | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
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