If any future peeps are getting missing file errors, set your system locale to Japanese BEFORE extracting the game.
I extracted first, and would get an error saying bgm was missing in the main menu. Checked the bgm folder and all the file names were jibberish:
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Extracted the game again AFTER switching locales and now everything looks good (below). Game loads and plays music now. Haven't played it much yet, but so far no more errors.
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P.S. Thanks for the TL Taihen!