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.
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.