| .P11 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | Unknown Software | Unknown Developer |
| .P38 | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .P40 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .P41 | Tandy | Ficheiros de Imagem Raster | TRS-80 Image | 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 |
| .PAN | ProVUE Development | Ficheiros de Base de Dados | Panorama Database File | Unknown Software | Unknown Developer |
| .PAQ6 | Open Source | Ficheiros Compactados | PAQ6 Data Archive | WinUDA | Unknown Developer |
| .PARA | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PARAMFILE | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PARSER | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PASCAL | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PATCHER | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PATH | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PAUSE | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PAYROLL | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PBMP | Unknown Developer | Ficheiros de Imagem Raster | Renamed UNIX Portable Bitmap Graphic (PBM) File | Unknown Software | Unknown Developer |
| .PBP | Sony | Ficheiros de Jogo | PSP Firmware Update File | PBP Unpacker | Unknown Developer |
| .PC9 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PC?= | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PCO | Unknown Developer | Ficheiros de Texto | PC-Outline Outline | Unknown Software | Unknown Developer |
| .PD0 | SonTek | Ficheiros de Sistema | SonTek Firmware File | Unknown Software | Unknown Developer |
| .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 |
| .PENIS | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PEPSI | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PFG | jEEPersDX | Ficheiros de Desenvolvedor | jEEPers Program Configuration File | jEEPers | Unknown Developer |
| .PG2 | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PG3 | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PGL | Hewlett-Packard | Ficheiros Gráficos | HP Plotter Language File Format | Unknown Software | Unknown Developer |
| .PG_ | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PHPUSERNAM | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PHR | Adobe Systems Incorporated | Ficheiros de Dados | RoboHelp Phrase List | Unknown Software | Unknown Developer |
| .PH_ | Unknown Developer | Ficheiros de Dados | C Poet Compressed Disk1 File | Unknown Software | Unknown Developer |
| .PII | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PJRPD | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PKPAK | Unknown Developer | Uncommon Files | Archive File | Unknown Software | Unknown Developer |
| .PLACEHOLDEREXTENSION | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PLAYSOUND | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PLOTTER | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PLUS | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PND | DATAIR | Ficheiros de Dados | DATAIR Pension System Pending Data | Unknown Software | Unknown Developer |
| .POD | Terminal Reality | Ficheiros de Jogo | Terminal Reality Game Data File | BR2PodTools | Unknown Developer |
| .POM | Apache Software Foundation | Uncommon Files | Maven Build File | Unknown Software | Unknown Developer |
| .PONGLIFE | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .POO | Open Source | Uncommon Files | Commodore C64 Machine Code | Unknown Software | Unknown Developer |
| .POSTSCRIPT | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PPN | Lexmark International, Inc. | Ficheiros de Dados | Lexmark Printer Firmware | Unknown Software | Unknown Developer |
| .PPT | Microsoft Corporation | Ficheiros de Dados | PowerPoint Presentation | Unknown Software | Unknown Developer |
| .PPT- | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PPVA | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PQN | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PRG | Open Source | Ficheiros Executáveis | Program File | Unknown Software | Unknown Developer |
| .PRINT | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PRISM | Apple | Ficheiros de Dados | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PRN | Various Developers | Ficheiros de Layout de Página | HP PCL Printer Output | Unknown Software | Unknown Developer |
| .PROG | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PRS | Software Publishing Corporation (SPC) | Ficheiros de Dados | Harvard Graphics Presentation | PRS Builder | Unknown Developer |
| .PRUI | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PSI | SAPIEN Technologies | Uncommon Files | PrimalScript Online Help Shortcut | Unknown Software | Unknown Developer |
| .PT3 | Harvard Graphics | Uncommon Files | Harvard Device Driver File | Unknown Software | Unknown Developer |
| .PTB | Sage | Ficheiros de Cópia de Segurança | Sage 50 Backup File | Power Tab Editor | Unknown Developer |
| .PTF | Sony | Ficheiros de Configurações | PSP Theme File | PSP Theme Toolbox | Unknown Developer |
| .PUT | Micro Fox Software | Ficheiros Compactados | PUT Compressed Data | Unknown Software | Unknown Developer |
| .PUZZLE | Unknown Developer | Uncommon Files | X11 Puzzle File | Unknown Software | Unknown Developer |
| .PVD | Varden Development | Ficheiros de Dados | Polygen3D Vector Descriptor | HPI Instalit | Unknown Developer |
| .PVI | Canon Inc. | Ficheiros de Dados | Canon Picture Browser Cache Index | Unknown Software | Unknown Developer |
| .PVL | Unknown Developer | Ficheiros de Dados | Instalit Library | HPI Instalit | Unknown Developer |
| .PVP | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PY1 | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PYB | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PZI | Unknown Developer | Ficheiros Gráficos | Pizazz Plus Graphics File | Unknown Software | Unknown Developer |
| .P_G | Unknown Developer | Uncommon Files | Uncommon File Extension | Unknown Software | Unknown Developer |
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