http://bugs.winehq.org/show_bug.cgi?id=20011
--- Comment #2 from Juan Lang juan_lang@yahoo.com 2009-09-11 11:04:28 --- Created an attachment (id=23556) --> (http://bugs.winehq.org/attachment.cgi?id=23556) Patch: Implement retrieving the encoded signer of a decoded signed message
Does this help at all?