"I have Sibelius 7 (music composition software) which I've been using on my Windows laptop for the last couple of years. I have now moved over to a Macbook Pro & am unable to install my Sibelius program. When I try to open any of the disc folders, I receive a message : You cant open the application Sibelius7Installer.exe because Microsoft Windows applications are not supported on OS X. Yet it clearly states on my Sibelius boxed set (very expensive software) that it is compatible with both Windows and Mac. Please help!!"