CRT File: What is it?

Reporter:   |   Edited: December 05, 2018

Microsoft Silver

CRT File Summary

The CRT File Extension has one primary file type, Security Certificate format, and can be opened with four distinctive software programs, with the dominant related application developed by Microsoft Corporation (Internet Explorer software). CRT files are categorized ordinarily as Web Files.

The CRT File Extension can be viewed on the Windows, Mac, and iOS operating systems. They are supported on both desktop and mobile devices. The main CRT file type has a Popularity Rating of "Low", meaning these files are not frequently present on your typical desktop or mobile device.

Please see the detailed information below to learn more about CRT files and the programs that can open them. In addition, we provide simple troubleshooting information to help you open your CRT file.

Low
Popular
1754
Standing

/ 11690

Active

Importance

5

December

2018

Page Last Updated

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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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CRT Demand


Popular Devices

Desktop (84.34%)
Mobile (14.29%)
Tablet (1.37%)


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

Quiz: Which file extension is the oldest in existence?









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