C21 File Extension

What is C21 file?

C21 filename suffix is mostly used for CARE-S InfoWorks Defined Pollutant Detail files. CARE-S InfoWorks Defined Pollutant Detail format was developed by SINTEF. C21 file format is compatible with software that can be installed on Windows system platform. C21 file format, along with 6033 other file formats, belongs to the Misc Files category. CARE-S is by far the most used program for working with C21 files. CARE-S software was developed by SINTEF, and on its official website you may find more information about C21 files or the CARE-S software program.

Programs which support C21 file extension

The following listing features C21-compatible programs. C21 files can be encountered on all system platforms, including mobile, yet there is no guarantee each will properly support such files.

How to open file with C21 extension?

There can be multiple causes why you have problems with opening C21 files on given system. What is important, all common issues related to files with C21 extension can be resolved by the users themselves. The process is quick and doesn’t involve an IT expert. The following is a list of guidelines that will help you identify and solve file-related problems.

Step 1. Install CARE-S software

Problems with opening and working with C21 files are most probably having to do with no proper software compatible with C21 files being present on your machine. To address this issue, go to the CARE-S developer website, download the tool, and install it. It is that easy The full list of programs grouped by operating systems can be found above. One of the most risk-free method of downloading software is using links provided by official distributors. Visit CARE-S website and download the installer.

Step 2. Update CARE-S to the latest version

You still cannot access C21 files although CARE-S is installed on your system? Make sure that the software is up to date. 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 C21 files are not compatible with CARE-S. The latest version of CARE-S should support all file formats that where compatible with older versions of the software.

Step 3. Associate CARE-S InfoWorks Defined Pollutant Detail files with CARE-S

If you have the latest version of CARE-S installed and the problem persists, select it as the default program to be used to manage C21 on your device. The method is quite simple and varies little across operating systems.

The procedure to change the default program in Windows

• Right-click the C21 file and choose Open with option
• Click Choose another app and then select More apps option
• The last step is to select Look for another app on this PC option supply the directory path to the folder where CARE-S is installed. Now all that is left is to confirm your choice by selecting Always use this app to open C21 files and clicking OK.

The procedure to change the default program in Mac OS

• By clicking right mouse button on the selected C21 file open the file menu and choose Information
• Open the Open with section by clicking its name
• From the list choose the appropriate program and confirm by clicking Change for all....
• If you followed the previous steps a message should appear: This change will be applied to all files with C21 extension. Next, click the Continue button to finalize the process.

Step 4. Ensure that the C21 file is complete and free of errors

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 C21 file. It is probable that the file is corrupted and thus cannot be accessed.

1. Verify that the C21 in question is not infected with a computer virus

If the C21 is indeed infected, it is possible that the malware is blocking it from opening. Immediately scan the file using an antivirus tool or scan the whole system to ensure the whole system is safe. If the C21 file is indeed infected follow the instructions below.

2. Check whether the file is corrupted or damaged

If you obtained the problematic C21 file from a third party, ask them to supply you with another copy. The file might have been copied erroneously and the data lost integrity, which precludes from accessing the file. It could happen the the download process of file with C21 extension was interrupted and the file data is defective. Download the file again from the same source.

3. Ensure that you have appropriate access rights

Sometimes in order to access files user need to have administrative privileges. Log out of your current account and log in to an account with sufficient access privileges. Then open the CARE-S InfoWorks Defined Pollutant Detail file.

4. Check whether your system can handle CARE-S

If the system is under havy load, it may not be able to handle the program that you use to open files with C21 extension. In this case close the other applications.

5. Ensure that you have the latest drivers and system updates and patches installed

Latest versions of programs and drivers may help you solve problems with CARE-S InfoWorks Defined Pollutant Detail files and ensure security of your device and operating system. It is possible that one of the available system or driver updates may solve the problems with C21 files affecting older versions of given software.

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