.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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Home File Types Web Files 509

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 Japan, with a majority of them running Windows 10. A high percentage of these users browse the web using Google Chrome.

Associated Developers and Software

	Apple Safari by Apple
	Adobe Acrobat DC by Adobe Systems Incorporated
	Mozilla Firefox by Mozilla
	Internet Explorer by Microsoft Corporation
	Adobe Reader by Adobe Systems Incorporated

Top 509 User Languages

Top 509 File User Browsers

Desktop Friendly?

Mobile Friendly?

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
.SAZ	Microsoft Corporation	Compressed Files	Fiddler Session Archive ZIP Data
.MSH1	Microsoft Corporation	Developer Files	Microsoft Shell Script File
.COVERAGE	Microsoft Corporation	Data Files	Visual Studio Code Coverage Report
.JHTML	Oracle Corporation	Web Files	Java HTML Web Page
.LGH	Microsoft Corporation	Data Files	Microsoft Windows Application Log File
.JFW	ESRI	GIS Files	JPEG World File
.DD	Sage	Data Files	Sage MAS 90 Data File
.ATF	Molecular Devices	Data Files	Axon Text File
.XLTHTML	Microsoft Corporation	Spreadsheet Files	Microsoft Excel HTML Spreadsheet Template