I just have my windows 11 automatically updated and old w10 ribbon has disappeared (earlier updates never affected w10 ribbon). I went back to regedit as you said. Blocked folder was already there but there was no file {e2bf9676-5f8f-435c-97eb-11607a5bedf7} that I created before (it was some other file unknown to me)
I added back {e2bf9676-5f8f-435c-97eb-11607a5bedf7} as instructed (see photo) but now it is not working anymore.
Please help me remove this horrible w11 explorer and restore my w10 explorer.
Thanks