plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSQLServer%2B%E3%83%91%E3%83%A9%E3%83%A1%E3%83%BC%E3%82%BF%E3%81%A8%E6%88%BB%E3%82%8A%E5%80%A4%E3%81%AE%E8%A8%AD%E5%AE%9A
plugin=diff is not implemented.