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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .P10 | Open Source | Uncommon Files | Certificate Request File | Apple Mail | Apple |
| .P38 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .P7B | Microsoft Corporation | Web Files | PKCS #7 Certificate File | Apple Keychain Access | Apple |
| .P7C | Microsoft Corporation | Web Files | PKCS #7 Certificate File | Apple Keychain Access | Apple |
| .P7S | Unknown Developer | Encoded Files | PKCS #7 Signature File Format | Apple Mail | Apple |
| .PAC | NetScape | Web Files | Proxy Auto-Config File | Apple Safari | Apple |
| .PAGE | Hybrid Server Pages Group | Web Files | HybridJava Web Page | Apple TextEdit | Apple |
| .PAGES | Apple | Text Files | Apple Pages Document | iWork | Apple |
| .PAINT | Apple | Uncommon Files | MacPaint Bitmap Graphics | MacPaint | Apple |
| .PANIC | Open Source | System Files | Kernel Panic File | macOS | Apple |
| .PANO | Microsoft Corporation | Raster Image Files | Camera Panoramic Picture | Apple QuickTime Player | Apple |
| .PARSER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PASCAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PASS | Apple | Data Files | Xcode Wallet Data | Apple Xcode | Apple |
| .PATCHER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PATH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PAUSE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PAX | Portable Operating System Interface (POSIX) Consortium | Compressed Files | PAX Archive | Apple Archive Utility | Apple |
| .PAYROLL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PBPROJ | Apple | Developer Files | Project Builder Project | Apple Xcode | Apple |
| .PCH | MSC Software | Data Files | Nastran Punch Output File | Apple Xcode | Apple |
| .PCS | Pfaff | CAD Files | Pfaff Embroidery File | Apple OS X | Apple |
| .PCT | Apple | Page Layout Files | Macintosh PICT Format | Apple Preview | Apple |
| Adobe Systems Incorporated | Page Layout Files | Portable Document Format File | Apple Pages | Apple | |
| .PDU | Unknown Developer | Text Files | Protocol Data Unit Message | Apple TextEdit | Apple |
| .PEM | Microsoft Corporation | Web Files | Privacy Enhanced Mail Certificate | Apple Keychain Access | Apple |
| .PEPSI | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PER | Microsoft Corporation | Game Files | Age Of Empires Personality File | Apple TextEdit | Apple |
| .PG2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PG3 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PHL | Amazon | eBook Files | Kindle Popular Highlights File | Apple TextEdit | Apple |
| .PHP | Panic | Web Files | PHP Source Code File | Apple TextEdit | Apple |
| .PHP5 | Open Source | Web Files | PHP 5 Web Page | Apple Safari | Apple |
| .PHTM | The Catalina Group | Web Files | PHP-Based Web Page | Safari | Apple |
| .PHTML | Opera Software | Web Files | PHP Web Page | Safari | Apple |
| .PIC | John Bridges | Raster Image Files | Generic Picture File | Apple Preview | Apple |
| .PICS | Apple | Graphic Files | Apple Mac PICT Drawing Sequence File | QuickDraw | Apple |
| .PICT | Apple | Page Layout Files | Macintosh PICT Format | Apple Preview | Apple |
| .PID | Open Source | Uncommon Files | Process ID File | Apple TextEdit | Apple |
| .PII | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PIQT | Apple | Data Files | Apple QuickTime Still File | Apple QuickTime Player | Apple |
| .PIZ | Winrar | Compressed Files | Zipped File | Apple Archive Utility | Apple |
| .PJP | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Apple Safari | Apple |
| .PJPEG | Microsoft Corporation | Raster Image Files | Progressive JPEG Image | Safari | Apple |
| .PKG | Apple | Compressed Files | Apple MacOS Installer Package | macOS | Apple |
| .PKPASS | Apple | Uncommon Files | Passbook Pass File | Apple Passbook | Apple |
| .PKS | Oracle Corporation | Data Files | Oracle Package Spec File | Apple TextEdit | Apple |
| .PLAYSOUND | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PLIST | Apple | Settings Files | Property List XML File | Apple Xcode | Apple |
| .PLOTTER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PLS | Various Developers | Audio Files | Audio Playlist | Apple iTunes | Apple |
| .PLUGIN | Adobe Systems Incorporated | Plugin Files | Adobe Photoshop Plugin | Apple QuickTime Player | Apple |
| .PLUS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PNG | The Pixelmator Team | Raster Image Files | Portable Network Graphics | Apple Safari | Apple |
| .PNT | Apple | Raster Image Files | MacPaint File | MacPaint | Apple |
| .PONGLIFE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .POP | Valve | Game Files | Team Fortress 2 Population File | Apple Preview | Apple |
| .PORT | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .POSTSCRIPT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PP | Geckonization | Data Files | Pocket Physics Sketch File | Apple TextEdit | Apple |
| .PPC | Garmin | GIS Files | XMap Flight Plan Statistic File | macOS | Apple |
| .PPS | Microsoft Corporation | Data Files | PowerPoint Slide Show | Apple Keynote | Apple |
| .PPT | Microsoft Corporation | Data Files | PowerPoint Presentation | Apple Keynote | Apple |
| .PPTX | Microsoft Corporation | Data Files | PowerPoint Open XML Presentation | Apple Keynote | Apple |
| .PREF | Unknown Developer | Settings Files | Preferences File | macOS | Apple |
| .PREFPANE | Apple | System Files | Mac OS X System Preference Pane | Apple OS X | Apple |
| .PRF | Microsoft Corporation | Settings Files | Outlook Profile File | Apple AppleWorks | Apple |
| Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple | |
| .PRINTER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .PRISM | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .PROFILE | GNU Operating System | System Files | Bash Shell Profile | Apple Terminal | Apple |
| .PROJ | Apple | Data Files | Apple NeXT Interface Builder Project | Apple Interface Builder | Apple |
| .PROPERTIES | Mojang | Game Files | Minecraft Properties File | Apple TextEdit | Apple |
| .PSD | Adobe Systems Incorporated | Raster Image Files | Adobe Photoshop Document | Apple Preview | Apple |
| .PSP | Corel Corporation | Raster Image Files | PaintShop Pro Image | Safari | Apple |
| .PUBLIC | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .PYM | VRVis (Vienna University of Technology) | Developer Files | PYM Macro Preprocessor File | Apple TextEdit | Apple |
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