New
#1
Can not change old default Windows Program Viewer to new "Photos"
For a friend trying to help is the opposite of most posts trying to get rid of Photos (the Win 10 new recommended to change to another.
In my friends case in settings default in both sections to change defaults - either for pictures or for .jpg files the option box to change program opens and lists 4 including "photos" but can not change the default to any from old Windows Picture Viewer. Can't change to paint either. will not allow change FROM Windows Picture Viewer to newer Photo.
I suspect registry entry issue but from other posts, it is usually the opposite, need register change away FROM Photos but in my case trying to get TO new Photos. Haven't found exactly what registry entry to look for.