Originally Posted by davidfor
@BetterRed: Have you looked at the Open With plugin? You should be able to configure an entry to open your executable against the file you want to change in the list. Maybe you will need to wrap it in a batch file to parse the folder path out.
Actually, you should be able to configure Open With to pass the PDF or RTF to your batch file or script without reading the metadata.opf file.
The down side is Open With only operates on one book at a time, not all selected books.