title: WinAPI failure. win 8.1 (build 9431) as win 8 (build 9200)
body: <p>I'm using <code>GetVersionEx</code> WinAPI call to get info about system. However it returns wrong build number for <code>Windows 8.1</code>.</p>
  
  <p>Have been looking info but didn't find about that. It is probably windows bug but want to ask and be sure if <code>Windows 8.1</code> support all previous API calls.</p>