http://bugs.winehq.org/show_bug.cgi?id=17269
--- Comment #4 from Andrew Nguyen arethusa26@gmail.com 2009-03-03 03:34:14 --- Created an attachment (id=19764) --> (http://bugs.winehq.org/attachment.cgi?id=19764) Forward user.exe.WNetGetUser16 to mpr.dll.WNetGetUserA
Try this patch and see if your program works properly with it.