How to open COMPANION files
Did your computer fail to open a COMPANION file? We explain what COMPANION files are and recommend software that we know can open or convert your COMPANION files.
What is a COMPANION file?
The COMPANION file extension indicates to your device which app can open the file. However, different programs may use the COMPANION file type for different types of data.
While we do not yet describe the COMPANION file format and its common uses, we do know which programs are known to open these files, as we receive dozens of suggestions from users like yourself every day about specific file types and which programs they use to open them.
We are continually working on adding more file type descriptions to the site, so if you have information about COMPANION files that you think will help others, please use the Update Info link below to submit it to us - we'd love to hear from you!
These apps are known to open certain types of COMPANION files. Since many different programs may use COMPANION files for different purposes, you may need to try a few of the apps to open your specific COMPANION file.