plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSqlServer%2B%E5%87%BA%E5%8A%9B%E3%81%99%E3%82%8B%E8%A4%87%E6%95%B0%E8%A1%8C%E3%81%AE%E3%83%87%E3%83%BC%E3%82%BF%E3%82%92%E4%B8%80%E8%A1%8C%E3%81%AB
plugin=diff is not implemented.