Uwe Bonnes wrote:
Perpaps some serial spy would be of help. Capture the communication of the windows program with the device, do the same under wine and compare.
However I don't have a suggestion for a serial caputure program for you :-(
How about the freeware Portmon from sysinternals: http://www.sysinternals.com/Utilities/Portmon.html
It helped me a lot...
Cheers, Cihan