that's what I tried yesterday :(
it doesn't lead to an error or hanging / queued workflow jobs if I use this Syntax, but the Input is simply ignored.
The workflow will be startet / executed with exactly the parameter already present in the xml.
Currently I'm on V10SP8+ and planning to update to SP9 next week. maybe this helps fix the problem
I found my problem !
I started a PowerShell and from there a "cmd" prompt on my Windows Server, before issueing the command.
Now I startet a "cmd" directly from "Start" and the input is processed as expacted.
Did I already mention, that I don't like Windows Commandline Processing ?
Thanx for your help