| .P11 | HERE | Uncommon Files | HERE Maps For Android Map Data Package | Unknown Software | Unknown Developer |
| .P38 | Apple | Data Files | 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 | Raster Image Files | TRS-80 Image | Unknown Software | Unknown Developer |
| .P56 | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | Unknown Developer |
| .PAN | ProVUE Development | Database Files | Panorama Database File | Unknown Software | 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 | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PASCAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PATCHER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PATH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PAUSE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PAYROLL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PBMP | Unknown Developer | Raster Image Files | Renamed UNIX Portable Bitmap Graphic (PBM) File | Unknown Software | 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 | Text Files | PC-Outline Outline | Unknown Software | Unknown Developer |
| .PD0 | SonTek | System Files | 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 | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PG2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PG3 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PGL | Hewlett-Packard | Graphic Files | 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 | Data Files | RoboHelp Phrase List | Unknown Software | Unknown Developer |
| .PH_ | Unknown Developer | Data Files | C Poet Compressed Disk1 File | Unknown Software | Unknown Developer |
| .PII | Apple | Data Files | 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 | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PLOTTER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PLUS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PND | DATAIR | Data Files | DATAIR Pension System Pending Data | Unknown Software | Unknown Developer |
| .POM | Apache Software Foundation | Uncommon Files | Maven Build File | Unknown Software | Unknown Developer |
| .PONGLIFE | Apple | Data Files | 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 | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PPN | Lexmark International, Inc. | Data Files | Lexmark Printer Firmware | Unknown Software | Unknown Developer |
| .PPT | Microsoft Corporation | Data Files | 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 | Executable Files | Program File | Unknown Software | Unknown Developer |
| .PRINT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PRISM | Apple | Data Files | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PRN | Various Developers | Page Layout Files | HP PCL Printer Output | Unknown Software | Unknown Developer |
| .PROG | Unknown Developer | Uncommon Files | Unknown File Type | Unknown Software | 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 |
| .PUT | Micro Fox Software | Compressed Files | PUT Compressed Data | Unknown Software | Unknown Developer |
| .PUZZLE | Unknown Developer | Uncommon Files | X11 Puzzle File | Unknown Software | Unknown Developer |
| .PVD | Varden Development | Data Files | Polygen3D Vector Descriptor | Unknown Software | Unknown Developer |
| .PVI | Canon Inc. | Data Files | Canon Picture Browser Cache Index | Unknown Software | 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 | Graphic Files | 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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