Undo and redo can be taken from mspaint.exe (paint has the icons too in it's title bar), resources 38001 to 38008 are the icons.
It cannot be used because they are in the bitmap section of the executable and that registry entry looks for an icon, just tried then
Ah that's why I get a white rectangular when pointing to that resource But does it work if you do it like "Icon"="C:\undo.ico"? Then you could extract the bitmaps from mspaint, convert them to icons and voila
Isn't that a little much work for 5 icons? It's easy, but it's easier to just put the icons on the drive.
Redpill v1.2.0.07 online in five min, with update reg for ribbon (Always from G0B1!N5486) and integrate undo & redo icon