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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .P12 | RSA Laboratories | Web Files | Personal Information Exchange File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .P7 | Open Source | Web Files | PKCS #7 Digital Certificate File | OpenSSL | Open Source |
| .P7B | Microsoft Corporation | Web Files | PKCS #7 Certificate File | Microsoft Windows | Microsoft Corporation |
| .P7C | Microsoft Corporation | Web Files | PKCS #7 Certificate File | Microsoft Windows | Microsoft Corporation |
| .PAC | NetScape | Web Files | Proxy Auto-Config File | Internet Explorer | Microsoft Corporation |
| .PAG | Microsoft Corporation | Web Files | Visual Basic Property PAGe File | Microsoft Visual Basic | Microsoft Corporation |
| .PAGE | Hybrid Server Pages Group | Web Files | HybridJava Web Page | Notepad++ | Don Ho |
| .PEM | Microsoft Corporation | Web Files | Privacy Enhanced Mail Certificate | Microsoft IIS | Microsoft Corporation |
| .PHP | Panic | Web Files | PHP Source Code File | Microsoft Notepad | Microsoft Corporation |
| .PHP2 | Open Source | Web Files | PHP 2 Web Page | Vim | Bram Moolenaar |
| .PHP3 | Open Source | Web Files | PHP 3 Web Page | MacroMates TextMate | MacroMates |
| .PHP4 | Open Source | Web Files | PHP 4 Web Page | MacroMates TextMate | MacroMates |
| .PHP5 | Open Source | Web Files | PHP 5 Web Page | MacroMates TextMate | MacroMates |
| .PHT | Microsoft Corporation | Web Files | Partial Hypertext | Internet Explorer | Microsoft Corporation |
| .PHTM | The Catalina Group | Web Files | PHP-Based Web Page | Microsoft Notepad | Microsoft Corporation |
| .PHTML | Opera Software | Web Files | PHP Web Page | Apache Tomcat | Apache Software Foundation |
| .PIM | Avid Technology | Web Files | Pro Tools Controller Plug-in Mappings File | Avid Pro Tools | Avid Technology |
| .PMX | Yu Higuchi | Web Files | MikuMikuDance Model File | MikuMikuDance | Yu Higuchi |
| .PNQ | Mail.Ru | Web Files | ICQ Instant Message File | ICQ | Mail.Ru |
| .PPTMHTML | Microsoft Corporation | Web Files | Microsoft PowerPoint MIME HTML Presentation | Microsoft PowerPoint | Microsoft Corporation |
| .PRF | Microsoft Corporation | Web Files | Outlook Profile File | Microsoft Outlook 2016 | Microsoft Corporation |
| .PRO | Adobe Systems Incorporated | Web Files | Adobe Proto Design File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .PSP | Corel Corporation | Web Files | PaintShop Pro Image | Corel Painter | Corel |
| .PTW | Autodesk, Inc. | Web Files | AutoCAD Publish To Web File | Autodesk AutoCAD | Autodesk, Inc. |
| .PUB | Microsoft Corporation | Web Files | Microsoft Publisher Document | LibreOffice | The Document Foundation |
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