You need a copy of an NES emulator (like Nesticle) and the Musashi ROM to play this.
Also, if you want to hack savestates you'll need the program for it. For the emulator, I suggest
Zophar's Domain. As for the ROM, you can probably find it by searching at Google. Search for "Hex Editors" here for a good hex editor (I use Hex Workshop).
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