.509 File Overview
| 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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What is File Extension 509?
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.
Associated Developers and Software
 | 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 |
Top 509 User Languages
Top 509 File User Browsers
Desktop Friendly?
Mobile Friendly?
Most Popular 509 File Countries
Top User Operating Systems
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
Associated Operating Systems
 | Windows |
 | Mac |
 | iOS |
 | Android |
 | Linux |
Other File Types Related to 509 Files
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .CER | Microsoft Corporation | Web Files | Internet Security Certificate |
| .DSS | The International Voice Association (IVA) | Audio Files | Digital Speech Standard File |
| .RDP | Microsoft Corporation | Settings Files | Remote Desktop Configuration File |
| .SYNC | Apple | Data Files | Apple ColorSync File |
| .EVT | Microsoft Corporation | System Files | Microsoft Windows 2000 And XP Event Log |
| .BKF | Microsoft Corporation | Backup Files | Windows Backup Utility File |
| .SDI | Intuit, Inc. | Data Files | QuickBooks Data File |
| .SEARCH-MS | Microsoft Corporation | Uncommon Files | Windows Saved Search File |
| .ACL | Microsoft Corporation | Uncommon Files | AutoCorrect List File |
| .VBHTML | Microsoft Corporation | Web Files | Microsoft Visual Studio ASP.NET Web Page |
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Compatible with Windows 11, 10, 8, 7, Vista, XP and 2000
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