C# Definition:

    [StructLayout(LayoutKind.Sequential)]
    public struct DWM_THUMBNAIL_PROPERTIES
    {
        public int dwFlags;
        public pub.Rect rcDestination;
        public pub.Rect rcSource;
        public byte opacity;
        public int fVisible; //BOOL{TRUE,FALSE}
        public int fSourceClientAreaOnly; //BOOL{TRUE,FALSE}
    }

VB Definition:

Please add one.

User-Defined Field Types:

None.

Notes:

Used with DwmUpdateThumbnailProperties.