CLS File - opening and understanding

Did your computer fail to open a CLS file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CLS files.

What is a CLS file?

A .CLS file is a Visual Basic class definition file. Through our analysis of CLS files, we know that one use of the format is Visual Basic class definition. We have not yet described in detail what these files contain and what they are used for, but our team is working tiredlessly through thousands of file formats. We'd love hearing from you if you have information about the format.

How to open CLS files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CLS for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 10 different CLS openers which you will find listed below.

Suggest another file format using extension CLS

While we know of one file format using the .CLS file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CLS file.

Various viewers for this file format

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.

Visual BasicVisual BasicUser submitted
NewSoft CD LabelerNewSoft CD LabelerUser submitted
MiKTeXMiKTeXUser submitted
ExamViewExamViewUser submitted
Stuffit ExpanderStuffit ExpanderUser submitted
TeXworks editorTeXworks editorUser submitted
Any Video Converter ProfessionalAny Video Converter ProfessionalUser submitted
WinEdtWinEdtUser submitted
Flash Movie PlayerFlash Movie PlayerUser submitted
progeCAD ProfessionalprogeCAD ProfessionalUser submitted
We have not verified any software that we know for certain will work with CLS-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with CLS-files. If you know one, please use the 'Suggest a program' link below and tell us about it!