Hi Syborg
Thanks for that. I downloaded the extension. Partial success. The extension has no effect on Windows Photo Viewer. WPV begins opening the file but then crashes with error report. Ive now selected 'Photos' to be the default .raf image viewer. All fuji firmware version 3 folders all populate quickly and open the image. All fujifilm version 4 folders are struggling to populate thumnail images, very randomly as if it will take weeks to populate thumbnails in all folders. Very strange. The ones it has populated when opened quickly change their appearance from settings taken to whatever the Photos app thinks it should look like. lol. Its certainly something to do with the version 4 firmware. Such a shame as i was so very happy with my work flow previously inspecting images in Windows Photo Viewer before opening them in Capture One if i wanted to edit.
My workaround may be to start taking all photos in RAW and JPEG. Seems to make sense in light of this mysterious problem.
Thanks for the help
Regards... Steve