hmm: ansible win -i hosts -m raw -a “start-process powershell” seems to work fine for me (though not sure what purpose that would serve, since the process will get nuked when the winrm connection closes).
When you say ‘spawning new Windows’ it makes me think maybe you are expecting applications to start up and display a graphical user interface?
You are unlikely to be able to do this as you won’t have an interactive user session (just winrm remoting session).
Starting services and command line applications is likely to be fine though as typically services don’t start new windows and command line (STDOUT, STDERR) output can be captured and returned from the winrm remote session.