Bad news, even the registry hack didn't work for me (I wanted them smaller). No matter what I set the registry value to, I got the same default size icons. I think it's the middle size. Can't believe Microsoft built something that doesn't work.
“No matter what I set the registry value to, I got the same default size icons”
https://www.youtube.com/watch?v=YHaunqOcntg <<<<< This registry hack gets favorable comments, so maybe it will work for you. There are others at YouTube.