Don't you know how to open the C21 file? We will help you.

File Extension C21

While searching for an answer to the question - How to open the C21 file? - you probably found websites, which offer software that was able to open any file extension. Do not be fooled, there is no one program that will allow you to work with any file extension, including the C21 file. Each program contains a different type of data and you need specialized software to properly work with the C21 file. Here is a list of programs that are designed to work with the C21 file - remember, these applications are able to open at most a few file extensions, they are designed to work with a specific data type.

File type CARE-S InfoWorks Defined Pollutant Detail
Developer SINTEF

Programs that open the C21 file


Common problems with the C21 file

C21 file is damaged

If after installing the program from a list, you still cannot open a file with the C21 extension, the reason may be that the file is damaged. The solution may be to find a new copy of the C21 file you want to open

The C21 file extension is not linked with the appropriate application

In this case, the easiest way is to use the tool built into the operating system for association of the C21 file with applications to support it. Double click on the file you cannot open - the operating system will display a list of programs that are likely to work with your C21 file. Choose one of them, or select the location on a disk where you installed one of the applications from our list. Windows should then open the C21 file using the program installed earlier.

The entry for the C21 file in the "Windows Registry" has been removed or damaged

Entries containing links of the C21 file extensions with applications is located in the HKEY_CLASSES_ROOT. If you do not know how to get to the Windows Registry, or how to make changes in it, ask a specialist for help. Lack of knowledge on the subject may cause irreversible changes on your computer.

The C21 file is infected by a virus

There may be a situation when a computer virus passes itself off as the C21 file. In this case, such a file will definitely not be opened. Download a good antivirus program and scan the C21 file mentioned. If the antivirus application detects malicious data, it may signify that the C21 file is infected.

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