| .P11 | HERE | Harvinaiset Tiedostot | HERE Maps For Android Map Data Package | Unknown Software | Unknown Developer |
| .P38 | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .P40 | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .P41 | Tandy | Rasterikuvatiedostot | TRS-80 Image | Unknown Software | Unknown Developer |
| .P50 | Unknown Developer | Harvinaiset Tiedostot | The Player Module | The Player | Unknown Developer |
| .P56 | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .P61 | Commodore International | Harvinaiset Tiedostot | 6.1a Module File | The Player | Unknown Developer |
| .PAN | ProVUE Development | Tietokantatiedostot | Panorama Database File | Unknown Software | Unknown Developer |
| .PAQ6 | Open Source | Pakatut tiedostot | PAQ6 Data Archive | WinUDA | Unknown Developer |
| .PARA | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PARAMFILE | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PARSER | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PASCAL | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PATCHER | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PATH | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PAUSE | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PAYROLL | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PBMP | Unknown Developer | Rasterikuvatiedostot | Renamed UNIX Portable Bitmap Graphic (PBM) File | Unknown Software | Unknown Developer |
| .PBP | Sony | Pelitiedostot | PSP Firmware Update File | PBP Unpacker | Unknown Developer |
| .PC9 | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PC?= | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PCO | Unknown Developer | Tekstitiedostot | PC-Outline Outline | Unknown Software | Unknown Developer |
| .PD0 | SonTek | Järjestelmätiedostot | SonTek Firmware File | Unknown Software | Unknown Developer |
| .PDFCEIBAL | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PDY | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PD_ | Unknown Developer | Harvinaiset Tiedostot | Visc15 Images Setup File | Unknown Software | Unknown Developer |
| .PENIS | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PEPSI | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PFG | jEEPersDX | Sovelluskehittäjän tiedostot | jEEPers Program Configuration File | jEEPers | Unknown Developer |
| .PG2 | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PG3 | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PGL | Hewlett-Packard | Graafiset Tiedostot | HP Plotter Language File Format | Unknown Software | Unknown Developer |
| .PG_ | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PHPUSERNAM | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PHR | Adobe Systems Incorporated | Datatiedostot | RoboHelp Phrase List | Unknown Software | Unknown Developer |
| .PH_ | Unknown Developer | Datatiedostot | C Poet Compressed Disk1 File | Unknown Software | Unknown Developer |
| .PII | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PJRPD | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PKPAK | Unknown Developer | Harvinaiset Tiedostot | Archive File | Unknown Software | Unknown Developer |
| .PLACEHOLDEREXTENSION | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PLAYSOUND | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PLOTTER | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PLUS | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PND | DATAIR | Datatiedostot | DATAIR Pension System Pending Data | Unknown Software | Unknown Developer |
| .POD | Terminal Reality | Pelitiedostot | Terminal Reality Game Data File | BR2PodTools | Unknown Developer |
| .POM | Apache Software Foundation | Harvinaiset Tiedostot | Maven Build File | Unknown Software | Unknown Developer |
| .PONGLIFE | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .POO | Open Source | Harvinaiset Tiedostot | Commodore C64 Machine Code | Unknown Software | Unknown Developer |
| .POSTSCRIPT | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PPN | Lexmark International, Inc. | Datatiedostot | Lexmark Printer Firmware | Unknown Software | Unknown Developer |
| .PPT | Microsoft Corporation | Datatiedostot | PowerPoint Presentation | Unknown Software | Unknown Developer |
| .PPT- | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PPVA | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PQN | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PRG | Open Source | Suoritettavat tiedostot | Program File | Unknown Software | Unknown Developer |
| .PRINT | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PRISM | Apple | Datatiedostot | Golden Orchard Apple II CD Rom File | Unknown Software | Unknown Developer |
| .PRN | Various Developers | Sivun asettelutiedostot | HP PCL Printer Output | Unknown Software | Unknown Developer |
| .PROG | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PRS | Software Publishing Corporation (SPC) | Datatiedostot | Harvard Graphics Presentation | PRS Builder | Unknown Developer |
| .PRUI | Unknown Developer | Harvinaiset Tiedostot | Unknown File Type | Unknown Software | Unknown Developer |
| .PSI | SAPIEN Technologies | Harvinaiset Tiedostot | PrimalScript Online Help Shortcut | Unknown Software | Unknown Developer |
| .PT3 | Harvard Graphics | Harvinaiset Tiedostot | Harvard Device Driver File | Unknown Software | Unknown Developer |
| .PTB | Sage | Varmuuskopiointitiedostot | Sage 50 Backup File | Power Tab Editor | Unknown Developer |
| .PTF | Sony | Asetustiedostot | PSP Theme File | PSP Theme Toolbox | Unknown Developer |
| .PUT | Micro Fox Software | Pakatut tiedostot | PUT Compressed Data | Unknown Software | Unknown Developer |
| .PUZZLE | Unknown Developer | Harvinaiset Tiedostot | X11 Puzzle File | Unknown Software | Unknown Developer |
| .PVD | Varden Development | Datatiedostot | Polygen3D Vector Descriptor | HPI Instalit | Unknown Developer |
| .PVI | Canon Inc. | Datatiedostot | Canon Picture Browser Cache Index | Unknown Software | Unknown Developer |
| .PVL | Unknown Developer | Datatiedostot | Instalit Library | HPI Instalit | Unknown Developer |
| .PVP | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PY1 | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PYB | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
| .PZI | Unknown Developer | Graafiset Tiedostot | Pizazz Plus Graphics File | Unknown Software | Unknown Developer |
| .P_G | Unknown Developer | Harvinaiset Tiedostot | Uncommon File Extension | Unknown Software | Unknown Developer |
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