George,
I just had the same thing happen to me today. Searched Google like you did... nothing at all! Worked through the reg to finally find this :
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID\{59031A47-3F72-44A7-89C5-5595FE6B30EE}
Just edit the Data field and there you go
Knew it was possible to change it back since we had not modified the main user folder, just a shortcut.
This is a serious bug and I will report it to MS.
Mark.