plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BDotNET%2B.NET%E3%81%8B%E3%82%89%E5%91%BC%E3%81%B3%E5%87%BA%E3%81%9B%E3%82%8BC%EF%BC%8B%EF%BC%8B%E3%83%A9%E3%82%A4%E3%83%96%E3%83%A9%E3%83%AA
plugin=diff is not implemented.