Oh man, had no idea about this program. Luckily it's open source and I can use DNspy to step thru the program. Took that and after a week of banging my head against the wall I have made an extractor and repacker for the FORIS games (Imouto de Ikou!, Miss Each Other, Summer 2, and Lost M). Need to polish it up a little bit before the program is ready to be released. Interestingly most of the CMP files seem to be useless data, the executable sits on top of the data and doesn't seem to be needed for anything. Currently the repacker doesn't transfer that data over. Here's an image for proof.
I've really wanted to play radish and don't know much Japanese, so was planning on just using deepl. Going to translate as I go so expect a bad mtl copy of summer radish in a year or so.
Edit:
Project link https://github.com/Project0verflow/Project0verflow