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Tested with OPSI 4.0.4.0
Winst 4.11.3.11
Works fine with Win7 x86 and x64 and probable with Windows XP.
by — S. Taube 2014/09/01 16:00
You need the Installer for Gpg4win 2.2.1.
And You can download it here: http://www.heise.de/download/gpg4win-1119466.html