Opening FSI files

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

What is a FSI 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 FSI 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 FSI files will hopefully be added soon.

If you have information about FSI 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 FSI

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

Microsoft Visual Studio CodeMicrosoft Visual Studio CodeUser submitted
FlightScope Firmware WriterFlightScope Firmware WriterUser submitted
Microsoft Visual Studio CTPMicrosoft Visual Studio CTPUser 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 FSI-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 FSI-files. If you know one, please use the Suggest link below and tell us about it!