https://bugs.winehq.org/show_bug.cgi?id=53940
--- Comment #17 from Louis Lenders xerox.xerox2000x@gmail.com --- So you can see that it is called like: C:\VARA\Vara.exe TCPIP 127.0.0.1 8300
If you run that command (wine Vara.exe TCPIP 127.0.0.1 8300) does also show the black window?