COMPANION9X File

Did your computer fail to open a COMPANION9X file? We explain what they are used for and recommend software that we know can open or otherwise handle your .COMPANION9X files.

What is a COMPANION9X file?

The COMPANION9X file extension indicates to your device which app can open the file. However, different programs may use the COMPANION9X file type for different types of data.

While we do not yet describe the COMPANION9X 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 COMPANION9X 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!

Various COMPANION9X file openers, viewers, etc.

These apps are known to open certain types of COMPANION9X files. Remember, different programs may use COMPANION9X files for different purposes, so you may need to try out a few of them to be able to open your specific file.

OpenTX CompanionOpenTX CompanionUser submitted

Try a universal file viewer

Try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and most likely yours too. Download Free File Viewer here.

We have not yet verified any programs for Mac that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!
We have not yet verified any web services that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!