COS File

What are COS files and how to open them

Are you having problems opening a COS file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your COS files.

What is a COS file?

A .COS file is a WinArcadia Saved State 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 COS files

Important: Different programs may use files with the COS file extension for different purposes, so unless you are sure which format your COS file is, you may need to try a few different programs.

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

Last updated: April 15, 2016

Various apps that use files with this extension

These apps are known to open certain types of COS files. Remember, different programs may use COS 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 COS file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.