@Randy Yep… this is similar to a screenshot I found while searching the web (the documentation does not mention any of that… aherm…)
Interesting you can not select a postprocessor of your choice.
I attached a screenshot of the save dialog (from the Save Toolpath). No place to specify a postprocessor either. At one point I suspected the extension would determine the post processor but multiple posts specify the same extension so that would be ambiguous (and so I suspect this is not what is happening).
I hope Rob (@robgrz ) can shed some light on this… but thanks again for pointing me in the right direction!