CER file is an internet security file associated with websites. The main purpose of such files is to provide the user with authentication and identification of the website itself along with the verification of the security of the website. These CER files are created by a security certificate authority which is generally a third party.
These certificates also tell about the security level of a specific website. Any person visiting the website is given certificate and the web browser checks that certificate. In case the certificate is expired or does not exist a warning is shown to the about the possible threats.
The list that follows enumerates programs compatible with CER files, divided into 3 categories based on operating system on which they are available. Files with CER suffix can be copied to any mobile device or system platform, but it may not be possible to open them properly on target system.
Problems with accessing CER may be due to various reasons. On the bright side, the most encountered issues pertaining to Internet Security Certificate files aren’t complex. In most cases they can be addressed swiftly and effectively without assistance from a specialist. The following is a list of guidelines that will help you identify and solve file-related problems.
The main and most frequent cause precluding users form opening CER files is that no program that can handle CER files is installed on user’s system. This one is an easy one. Select Microsoft Internet Explorer or one of the recommended programs (for example, Adobe Acrobat, Adobe Reader, Mozilla Firefox) and download it from appropriate source and install on your system. The full list of programs grouped by operating systems can be found above. The safest method of downloading Microsoft Internet Explorer installed is by going to developer’s website (Microsoft Corporation) and downloading the software using provided links.
If the problems with opening CER files still occur even after installing Microsoft Internet Explorer, it is possible that you have an outdated version of the software. Check the developer’s website whether a newer version of Microsoft Internet Explorer is available. Sometimes software developers introduce new formats in place of that already supports along with newer versions of their applications. This can be one of the causes why CER files are not compatible with Microsoft Internet Explorer. All of the file formats that were handled just fine by the previous versions of given program should be also possible to open using Microsoft Internet Explorer.
If the issue has not been solved in the previous step, you should associate CER files with latest version of Microsoft Internet Explorer you have installed on your device. The next step should pose no problems. The procedure is straightforward and largely system-independent
The procedure to change the default program in Windows
The procedure to change the default program in Mac OS
You closely followed the steps listed in points 1-3, but the problem is still present? You should check whether the file is a proper CER file. Being unable to access the file can be related to various issues.
Should it happed that the CER is infected with a virus, this may be that cause that prevents you from accessing it. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the CER file is indeed infected follow the instructions below.
If you obtained the problematic CER file from a third party, ask them to supply you with another copy. During the copy process of the file errors may occurred rendering the file incomplete or corrupted. This could be the source of encountered problems with the file. If the CER file has been downloaded from the internet only partially, try to redownload it.
There is a possibility that the file in question can only be accessed by users with sufficient system privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the Internet Security Certificate file.
The operating systems may note enough free resources to run the application that support CER files. Close all running programs and try opening the CER file.
Regularly updated system, drivers, and programs keep your computer secure. This may also prevent problems with Internet Security Certificate files. It may be the case that the CER files work properly with updated software that addresses some system bugs.
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