[winswitch] How to connect to linux server with non-standart SSH port using Xpra on Windows?

[Sergey Malkin]

Hello!
I have a linux server with Xpra started without binding to TCP port. SSH 
on server is listening on port 41. When connecting from another linux 
machine I can specify the SSH port in user's ssh config and connect to 
server typing just "xpra attach ssh:servername:$DISPLAY". But I can't 
use the same method on Windows because there is no SSH config. How to 
specify the SSH port for Xpra to use in that case?