How to open C09 files

Did your computer fail to open a C09 file? We explain what C09 files are and recommend software that we know can open or convert your C09 files.

What is a C09 file?

The C09 file extension indicates to your device which app can open the file. However, different programs may use the C09 file type for different types of data.

While we do not yet describe the C09 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 C09 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 C09

These apps are known to open certain types of C09 files. Since many different programs may use C09 files for different purposes, you may need to try a few of the apps to open your specific C09 file.

WISO SparbuchWISO SparbuchUser submitted
DT MaxDT MaxUser submitted
Cantax T2PlusCantax T2PlusUser submitted
T2 Pay-Per-FileT2 Pay-Per-FileUser submitted
Cantax T2Plus EducationalCantax T2Plus EducationalUser submitted
CANTAXCANTAXUser submitted
WISO FahrtenbuchWISO FahrtenbuchUser submitted
ZipZag ArchiverZipZag ArchiverUser 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 C09-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 C09-files. If you know one, please use the Suggest link below and tell us about it!