Ok, I added the chd and changed the launcher to point to the rom file and it loaded, which was progress. However, now it does not find the chd folder. It still works if launched directly from MAMEUI32, but doesn't work if launched in launchbox, i.e. it says "BOOT FAILURE: NO HARD DISK FOUND". I feel like something is named incorrectly or something, but confused because it works in MAMEUI32
Thanks again.