plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BCSharp%2B%E3%82%AA%E3%83%96%E3%82%B8%E3%82%A7%E3%82%AF%E3%83%88%E3%81%AE%E3%82%B5%E3%82%A4%E3%82%BA%E3%82%92%E6%B8%AC%E5%AE%9A
plugin=diff is not implemented.