| File Extension: | 509 |
| File Type Description: | Internet Security Certificate |
| File Type Developer: | Microsoft Corporation |
| Primary Associated Software: | Internet Explorer |
| Primary Software Developer: | Microsoft Corporation |
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Internet Security Certificate files are the most popular type of files to carry the 509 file extension, originally developed by Mozilla for Mozilla Firefox. According to our internal data, Internet Security Certificate files are most popular with users in United States, with a majority of them running Windows 10. A high percentage of these users browse the web using Google Chrome.
 | Mozilla Firefox by Mozilla |
 | Apple Safari by Apple |
 | Internet Explorer by Microsoft Corporation |
 | Adobe Reader by Adobe Systems Incorporated |
 | Adobe Acrobat DC by Adobe Systems Incorporated |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | iOS |
 | Android |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .CER | Microsoft Corporation | Web Files | Internet Security Certificate |
| .SRS | Microsoft Corporation | Settings Files | Outlook Send/Receive Settings File |
| .WAX | Microsoft Corporation | Audio Files | Windows Media Audio Redirect |
| .GNX | Microsoft Corporation | Data Files | Microsoft PowerPoint Data |
| .QDE | Microsoft Corporation | Executable Files | QDOS Executable |
| .DICPROOF | Microsoft Corporation | Settings Files | Microsoft Dictionary Proofing File |
| .OSD | Microsoft Corporation | Data Files | Open Software Description Data |
| .HT3 | Unknown Developer | Web Files | HTML File |
| .SNIP | Microsoft Corporation | Data Files | Microsoft Windows Snipping Tool Data File |
| .CPQ | Compaq | System Files | Compaq OEM Disc Configuration File |
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