How to open CIW files

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

What is a CIW file?

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

While we do not yet describe the CIW 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 CIW 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!

CIW opener

Unfortunately, we have not received enough suggestions for software that can open CIW files yet. If you know one, please use the Suggest a Program link below so we can update the page. Thanks!

Try a universal file viewer

Since we do not have any programs listed that we have verified can open CIW files, we suggest that you try a universal file viewer like Free File Viewer. It can open over 200 different types of files - and very likely yours too! Download Free File Viewer.