I happened to be poking around with Gensou shoujyo Taisen too,
Sorry, I am VERY sorry for replying an old post, but I am currently working on translation of Gensou Shoujo Taisen,
and is VERY interested in how you had successfully unpacked the .dat files >_<
If it's not too much trouble, would you teach me?
(for some reason "You are not allowed to search for posts in this forum", is that normal?)