Forgot to add that if you're using this tool for 64DD games, they require a different naming convention for symbol files.
They use the standard game ID format.
DKDJ.txt = Kyojin no Doshin (Doshin the Giant)
DKIJ.txt = Kyojin no Doshin demo
DKKJ.txt = Kyojin no Doshin: Kaihou Sensen Chibikko...