There should be a 13 gb file in the exeFS or romFS, and there may be an application on windows Mac or Linux you need to open it, use it to browse the file system, that's all I could think of.
I know that this thread is super old, but I'm having trouble getting the super metroid (WUP-JAJE) to work. It looks like there are extra bytes in the front, does anyone know how to properly trim the unnecessary bytes out?