What are potential problems for MFC Win7 application running on Win8?

I have MFC application which is using timers, USB ports and extensive use of

MSG msg;

do

{;}

while(PeekMessage( &msg, m_pView->GetSafeHwnd(), WM_TIMER, WM_TIMER, PM_REMOVE));

}

The application runs fine on Win7.

What kind of potential problems should I expect on Win8?

Thank you for your expertise!

Hi,

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