Open 509 file

509 file icon Did your computer fail to open 509 file? We explain what 509 files are and recommend software that we know can open your 509 files.

What is 509 file?

Files with 509 extension are associated with internet security of your server, web sites etc.

509 file description

The 509 file extension is used to secure your server, web site transactions, logins, webmail and connections with an SSL Certificate. Choose GlobalSign SSL Certificates for the highest levels of strong security, confidence and trust in your web site, corporate assets and online brand.

Mime: application/x-x509-ca-cert

Software that will open 509 file

Opera browser

A popular iInternet web browser and communiation suite


A popular free web browser from Mozilla

Microsoft Internet Explorer

The default web browser for older versions of Microsoft Windows. Replaced by Microsoft Edge browser.

What file extension actually is?

Simply put, file extensions are the characters after the dot in the file name, so for example filename.mp3 has file extension „mp3“. This helps Windows to identify which program should be used to open the file.

We can help you to open your file

Our database contains a huge list of different file extensions, usually with detailed description and programs that can be used to open or otherwise work with that particular file type.

Only original software

Every software listed in our database is verified and ve provide link to the developer or to the software own website, which should hopefuly be enough for you to download the most recent version of the program.