| 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 |
 | Adobe Reader by Adobe Systems Incorporated |
 | Internet Explorer by Microsoft Corporation |
 | 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 |
| .NEF | Nikon | Camera Raw Files | Nikon Electronic Format Camera RAW Image |
| .VUD | Microsoft Corporation | Data Files | Virtual Machine Undo Drive File |
| .AI | Adobe Systems Incorporated | Vector Image Files | Adobe Illustrator File |
| .XEL | Microsoft Corporation | Video Files | Expression Encoder Live Encoding File |
| .WOFF | Open Source | Font Files | Web Open Font Format File |
| .MFI | Microsoft Corporation | Data Files | Windows 98 Resource Kit Data Format |
| ._SLN100 | Microsoft Corporation | Data Files | Microsoft Visual Studio File |
| .ACS | Microsoft Corporation | Uncommon Files | Agent Character File |
| .ANDROID | Unknown Developer | Data Files | Android Readme File |
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