Thanks gfm688 for your answer!!!
I don't understand, why my code is wrong...but your code works excellent

Can you please explain the line to me?
Quote:
System::Call UxTheme::SetWindowTheme(i,w,w)i(r0,"","")
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What does (i,w,w)i(r0,"","") mean?
Is this line treated like a constant or can I change it?