Opening CSTF files

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

What is a CSTF file?

Every day users like you submit information to us about specific types of files, and which programs they use to open them.

While we do not yet have a description of the CSTF file format and what it is normally used for, we do know which programs are known to open these files. See the list of programs recommended by our users below.

We are constantly working on adding more file type descriptions to the site - the current count exceeds thousand by far, and more information about CSTF files will hopefully be added soon.

If you have information about CSTF files that you think will be helpful for others, please do use the Submit Info link below and we will add it to this page.

Generic CSTF

These apps are known to open certain types of CSTF files. Since many different programs may use CSTF files for different purposes, you may need to try a few of the apps to open your specific CSTF 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 CSTF-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 CSTF-files. If you know one, please use the Suggest link below and tell us about it!