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https://ja.hideki.hclippr.com/2007/08/06/gnupg-2-0-x%e3%82%92windows%e3%81%a7%e5%bc%b7%e5%bc%95%e3%81%ab%e4%bd%bf%e3%81%86%e6%96%b9%e6%b3%95%e3%80%81%e8%bf%bd%e8%a8%98/
GnuPG 2.0.xをWindowsで強引に使う方法、追記