How to open CT1 files

Did your computer fail to open a CT1 file? We explain what CT1 files are and recommend software that we know can open or convert your CT1 files.

What is a CT1 file?

The CT1 file extension indicates to your device which app can open the file. However, different programs may use the CT1 file type for different types of data.

While we do not yet describe the CT1 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 CT1 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!

Generic CT1

These apps are known to open certain types of CT1 files. Since many different programs may use CT1 files for different purposes, you may need to try a few of the apps to open your specific CT1 file.

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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 verified any programs that we know for certain can work with CT1-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 CT1-files. If you know one, please use the Suggest link below and tell us about it!