ak0ztik found a way: #post-7253369 #post-7254189 but if you still want to check, this is one of the ofs3 files: menu_other.bin most of them are matroska-like archives with more archives inside them.
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There's another archive format that needs to be decoded but you should probably ask the details directly to ak0ztik who was checking it, probably you need to know asm in order to reverse this format.
Last year I made this tool for "Tokimeki Memorial Girl's Side 3rd Story (PSP)", therefore I can't guarantee that it will work with SAO. However it seems to work with "menu_other.bin".
I know ak0ztik has already made his tool, so is fine if don't want to use mine, don't worry.
Sorry, I can't help you with asm.
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