http://bugs.winehq.org/show_bug.cgi?id=14339
--- Comment #8 from Hans Leidekker hans@it.vu.nl 2008-07-15 14:40:27 --- Created an attachment (id=14828) --> (http://bugs.winehq.org/attachment.cgi?id=14828) wininet: Insert cookie header in HttpSendRequest.
This is probably a duplicate of bug 14183. This patch, based on a patch from that bug by Yann Droneaud, should confirm it. Can you give it a try?