How to open C1D files

Did your computer fail to open a C1D file? We explain what C1D files are and recommend software that we know can open or convert your C1D files.

What is a C1D file?

The C1D file extension indicates to your device which app can open the file. However, different programs may use the C1D file type for different types of data.

While we do not yet describe the C1D 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 C1D 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 C1D

These apps are known to open certain types of C1D files. Since many different programs may use C1D files for different purposes, you may need to try a few of the apps to open your specific C1D file.

C1dViewC1dViewUser 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 verified any programs that we know for certain can work with C1D-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 C1D-files. If you know one, please use the Suggest link below and tell us about it!