I should add that I have gotten quite comfortable and even a bit adept at jockeying around on the virtual keyboard, so my workaround of keeping a renamed copy of the one ._ file that I don't want to get deleted is fast and easy. I keep the renamed copy in an adjacent directory, and when necessary I copy and paste a new copy back into the root directory and then just delete the single camo character from the front end of the filename, and I've got my ._ file back in place. So there's no need to spend any more time on trying to help me get Disk Tidy to do what I want. But, of course, I am still curious to know...