.FIR File

The fir file extension is mainly used for a special firmware update format for Canon EOS Digital Cameras.

You can import this type of fir files to the EOS camera through USB cable with Canon EOS firmware update utility.

How to open:

The only way to work with these files would be to use it for updating of firmware on your Canon camera.

How to convert:

Firmware updates usually cannot be converted to anything else.