static extern int DwmQueryThumbnailSourceSize(IntPtr thumb, out PSIZE size);
static extern int DwmQueryThumbnailSourceSize(IntPtr thumb, out PSIZE size);
static extern int DwmQueryThumbnailSourceSize(IntPtr thumb, out PSIZE size);
static extern int DwmQueryThumbnailSourceSize(IntPtr thumb, out PSIZE size);