According to MSDN remark from here: http://msdn.microsoft.com/en-us/library/ms633519%28VS.85%29.aspx GetWindowRect Function I don't have Vista/WIN7 anywhere to test it but if it's true I think there will be more similar API functions affected. I think this kind of possible issues/problems/bugs could be mentioned in remarks in Autoit's helpfile for Vista/WIN7 support.