thanks for the suggestion

I looked in the registry, found the value and changed it, but nothing happened. I have solved the problem though by putting a desktop.Ini file in my root directory
Code:
[.ShellClassInfo]
IconFile=c:\program files\plus!\themes\hd.ico
IconIndex=0

[ActivIcons]
UndoIconfile=
UndoIconIndex=0
now it works. Thanks again