Hi,
I've recently upgraded to Dopus 13.12. I'm having problems updating filetypes. For example if I try and remove an old filetype it is removed from the list, after the UAC elevator. After closing the filetypes window and then reopening the filetypes window it is still there and not deleted. Same with editing the (for example) open with entry. I also noticed the UAC elevator refers to Dopus 12?
It should say 13.
Re-run the Opus 13 installer, then reboot.