https://bugs.winehq.org/show_bug.cgi?id=50499
--- Comment #1 from James James@superbug.co.uk --- Test case for this: https://github.com/jcdutton/wine-testing
Run ./compile.sh to compile them. There is udpclient and udpserver program. The udpclient sends packets, but one can use "nc -u ip-address port" just instead of the client. The "udpserver" linux executable shows the behavior on Linux. The "udpserver.exe" windows executable shows the behavior on Wine and native Windows.
The aim is to get the output the same on both Windows and Wine, but currently it does not.