however, after decompiling the wad as far as I can, I noticed that its files are compressed using .ash format, which is usually only used by the system menu and ACCF.
very cool.
it also seems like no one has really ever properly broken through this compression either, with the raregamingdump wiki even noting that most of the game's data has...
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Source: https://gbatemp.net/threads/requesting- ... es.629971/