Very many thanks firstdefence for your speedy response. Your web suggestion works, of course, but I find I can only edit one .RAF file at a time. It is s good job I haven't got hundreds of files to change!!!
From my viewpoint, the automatic attachment of the Affinity Photo icon to imported RAW Fujifilm camera files loaded into the folder of the MAC environment is extremely unwelcome.
After loading my files from my camera into my MAC, it is not as though I have asked Affinity Photos to do any operation at all!
The only solution I think which is open to me is to unload Affinity Photo from my applications, and leave it on "the sidelines" somewhere until such time that Affinity Photo has rectified what I believe is interference with my imported files.
If my assumptions are wrong, I would welcome a correction, but loading Affinity Photos appears to have a trap-door mechanism with RAW files which eternally locks you to its own brand of software.
Thanks
Nick 12 June 2020 14:40 BST