Comment 35 on [http://thisismyinter.net/?p=21 this page] reports the same
thing. There are many more comments after that; you could read through
them and see if a workaround is mentioned. But I think it's probably not a
MacPorts bug; it's probably a wine bug, and if so, you would need to
[http://bugs.winehq.org/ file a bug] with the wine developers and hope
they fix it in a future release of wine.