CLS File Type- The quick facts
What are CLS files and how to open them
Are you having problems opening a CLS file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.
What is a CLS file?
A .CLS file is a Visual Basic Class Definition file.
We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.
How to open CLS files
Important: Different programs may use files with the CLS file extension for different purposes, so unless you are sure which format your CLS file is, you may need to try a few different programs.
While we have not verified the apps ourselves yet, our users have suggested 10 different CLS openers which you will find listed below.
Last updated: May 31, 2022
Various apps that use files with this extension
These apps are known to open certain types of CLS files. Remember, different programs may use CLS files for different purposes, so you may need to try out a few of them to be able to open your specific file.
Help us help others
File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CLS file formats, example files, or compatible programs. Please use the links below or email us at firstname.lastname@example.org to discuss further.