utility.bin files are usually connected to the wifi and nifi aspects of a game (open it in a hex editor and you will get messages in ASCII like "can not connect to the server"/"can not resolve DNS"). On rare occasions I have seen them or similarly named files in RPGs for something else but that is usually just text and will be with all the other files like it.
That is about all I know about them though as the wireless stuff is not usually my concern when hacking roms (all the important text is client side and what is in the utility.bin is usually in a European language even for Japanese roms).
A bit of copying and pasting from another reply I just made:
I have several hex editors I use. I posted them a few times elsewhere but can not seem to find it quickly
As for the already mentioned: http://www.romhacking.net/?category=13&...itle=&desc=
I unpacked this bin file with Tahaxan and it has several files inside. I'm interested in one of them named sound_dat.sdat.l. Tahaxan tell it's compressed file. I know how to open sdat file but I don't know how to open sdat.l file. Do you know something about sdat.l files?
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