.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 China, 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
	Mozilla Firefox by Mozilla
	Internet Explorer by Microsoft Corporation
	Adobe Reader by Adobe Systems Incorporated
	Adobe Acrobat DC 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
.CSR	Open Source	Web Files	Certificate Signing Request File
.BCM	Adobe Systems Incorporated	Data Files	Adobe Bridge Cache File
.CLB	Microsoft Corporation	System Files	COM+ Catalog File
.RBK	Microsoft Corporation	Backup Files	Windows 95 Registry Backup File
.ERL	INCA Internet	Uncommon Files	GameGuard Error Log File
.README	The Document Foundation	Text Files	Readme Text Document File
.OBT	Open Source	Settings Files	Openbox Theme File
.MSH	Martin Schweiger	3D Image Files	Orbiter 3D Mesh File
.DEC	Various Developers	Developer Files	Declaration File