I don’t think the script format is officially documented, in fact, it was in collaboration with a number of users here that we figured this out.
My example was mainly a way to play around and explore the environment in an effort to better understand the mechanism. I realise I forgot to supply the PNG image for the icon, so that may have caused it to choke. I’ve attached that now to my first post. Unzip the contents into the folder and you’ll have what I have, which does work for me.
All it does is open a command prompt and echo what it has received in the environment variable passed via the “Argument” parameter, and leave the command prompt window open so I can explore the environment. What you’ll need to do is probably call a batch file.
Make sure you’re putting it in the correct folder, on Windows (at least) there are another two folders of the same name. The quickest way to get to that folder is to use:
%PROGRAMDATA%\Steinberg\Audio Export Post Process Scripts
There’s another example here which you’ll find useful.