CRT Types

Leading CRT Type

.CRT

File Ext:	.crt
File Type:	Security Certificate

The CRT file is a certificate used by secure websites (beginning with "https://") to verify their authenticity.The CRT is distributed by companies such as Verisign and Thawte.The information stored in the certificate can be viewed by clicking the lock icon within the browser window.

Developer:	Mozilla
Division:	Web Files
Key:	HKEY_CLASSES_ROOT\.crt

Software Programs That Open The Security Certificate:

Internet Explorer by Microsoft Corporation

Windows

Mac

Mozilla Firefox by Mozilla

Windows

	Mac
	iOS

Android

Linux

Solaris

illumos

Google Chrome by Google

Windows

	Mac
	iOS

Android

Linux

Apple Safari by Apple

Windows

	Mac
	iOS

Android

Linux

Solaris

illumos

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Understanding CRT Issues

Frequent CRT Opening Issues

Internet Explorer is Not Installed

You attempt to load your CRT file and get an error such as "%%os%% Can't Open The CRT File Extension". If so, it typically means that you don't have Internet Explorer installed for %%os%%. You won't be able to double-click to open your CRT because your OS doesn't know what to do with it.

Tip: When you have another program installed that you know will open your CRT, you can select it from the other programs listed (see "Show Apps").

Internet Explorer is Out-of-Date

Your Security Certificate file is incompatible with Internet Explorer because you might have the wrong version installed. If you've got the wrong version of Internet Explorer installed, you'll need to install the correct version. Your Security Certificate file was probably created by a newer release of Internet Explorer than what's currently installed your computer.

Tip: Investigate your CRT file by right-clicking and selecting "Properties" to find clues on what version you need.

Conclusion: The majority of CRT file opening issues are due to not having the correct Internet Explorer version installed.

Other CRT File Issues

You can still experience errors opening CRT files even with the latest version of Internet Explorer installed on your PC. There can be other issues - unrelated to software - preventing you from opening CRT files. Problems unrelated to software:

• Windows Registry CRT file paths that are incorrect
• Unintentional removal of the description of the CRT file inside the Windows Registry
• Internet Explorer or another CRT application experienced a flawed installation
• The CRT itself is corrupted
• Past or present virus infection has affected your CRT
• Device drivers for CRT-related hardware are out-of-date
• Windows has inadequate resources to open your Security Certificate file