public static extern void DwmSetIconicThumbnail(IntPtr hwnd, IntPtr hbmp, DWM_SIT dwSITFlags);
public static extern void DwmSetIconicLivePreviewBitmap(IntPtr hwnd, IntPtr hbmp, RefPOINT pptClient, DWM_SIT dwSITFlags);
public static extern int DwmSetIconicLivePreviewBitmap(IntPtr hwnd, IntPtr hbmp, IntPtr pptClient, DWM_SIT dwSitFlags);
public static extern int DwmSetIconicThumbnail(IntPtr hwnd, IntPtr hbmp, DWM_SIT dwSitFlags);