Well now, more information... I suddenly thought, before I factory reset the husbands pc I would just check to see if his pic has the same issues with .mov files. And guess what, yes it does, exactly the same issues viewing any subdirectory with .mov files in it.
So that is 100% of the PCs under my control with this error.
Erm.... Hello.... Earth calling Microsoft..... Is anyone doing anything about this or is this a system feature designed to make us all switch to Apple so you don't have to bother?
Just wondering. Because not only can we not view our mov files, we cannot see anything that is in a subdirectory with them, and as someone who creates videos for a living this is pretty much everything on my hard drive.