plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSL%2B%E3%83%95%E3%82%A1%E3%82%A4%E3%83%AB%E9%81%B8%E6%8A%9E%EF%BC%88OpenFileDialog%EF%BC%89
plugin=diff is not implemented.