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