From looking at the supported cameras etc. it looks as if RawTherapee does support Hasselbad fff files. But I wondered if anybody has direct experience of the fff “flexcolor” files from the Flextight scanners?
Often scanner raw files are not mosaiced, this doesn’t seem to cause problems with DNG files from VueScan, but I have seen comments elsewhere about the fff format being problematic without Hassleblad’s own software.