Hi Vlada,

Thanks for your reply. I checked the documentation already before, unfortunately there's not mentioned how to pass more arguments as creationflags.

I checked my own code  again; I use subprocess.start(...) where the first argument is a list containing the executable name and all parameters.

Don't know how to pass to other flags to subprocess, and I'm not sure if this trick works with Popen too - but at least it's how I do it ;-)