Yes, that would work. It is kind of clumsy, having to write a batch file just because I want to pass a parameter to an existing program, but if there is no other way to do it, it will have to be done this way. I was looking for an existing client that might give me access to certain Windows functions, possibly using an ActiveXObject interface, but there seems to be no such thing in FM extendscript. There is an ActiveXObject in FrameScript, I think, and that does not seem to use a batch file to make it work.
perhaps ExternalObject could be a solution for that. ExternalObject allows ExtendScripts to call functions in C dlls.
So an ExternalObject works as a connector to a world outside of ExtendScripts, with interfaces in both ways.
There is an example for ExternalObjects in Adobe\Adobe Utilities\ExtendScript Toolkit CS4\SDK\Samples\cpp.
Don't know if this works or could be a solution for this and I don’t know if my thoughts are in the right direction.
I hope this information is useful nevertheless.
If there is a way, which is easier or if somebody has got experiences with ExternalObjects please let me know.