Upon downloading the tracks to a PC, there will be a "Secret" category, clicking that downloads a password protected zip file, the password is "Gilgamesh"
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You might also be trying to input the Japanese Square Enix Members serial code (on a red and black sheet of paper IIRC). The Bahamut code is actually on the inside of the small card sleeve that was on the outside spine of the CD case.
The zip is called ARR_120_something, the category (used to select that zip) is called Secret.
I would highly advise against posting that code like you have... If CS has any chance of helping you out, freely sharing it like that pretty much shoots it to hell.
After getting Before Meteor and having it as an insert on the case rather than a wrap, the wrap was a bit confusing (especially since I can't read japanese).