How to open COS files

Did your computer fail to open a COS file? We explain what COS files are and recommend software that we know can open or convert your files.

What is a COS file?

The COS file extension indicates to your device which app can open the file. However, different programs may use the COS file type for different types of data.

We are aware of 1 different use of the COS extension, which you can read more about below.

WinArcadia Saved State

Through our analysis of COS files, we know that one use of the format is WinArcadia Saved State. 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.

We have not verified any programs yet that works with this specific format. If you know any, please use the 'Suggest a program' link below. Thanks!

Software that will open, convert or fix COS files

These apps are known to open certain types of COS files. Since many different programs may use COS files for different purposes, you may need to try a few of the apps to open your specific COS file.

Command OpsCommand OpsUser submitted
Scenario MakerScenario MakerUser submitted
Cot Cot CothelloCot Cot CothelloUser submitted
ComptanooComptanooUser submitted
We have not verified any programs that we know for certain can work with COS-files on Mac. If you know one, please use the Suggest link below and tell us about it!
We have not verified any online services that we know for certain can work with COS-files. If you know one, please use the Suggest link below and tell us about it!