plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2B.NET4.0%2B%E3%83%95%E3%82%A1%E3%82%A4%E3%83%ABIO%E3%81%AE%E6%A9%9F%E8%83%BD%E5%BC%B7%E5%8C%96
plugin=diff is not implemented.