help with locale emulator

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man im clueless some games say i need it. what is it and how do i get it

 

[Meaning Less]

Instead of relying on an emulator, try just setting up your system locale once and you will be able to run every japanese game without worrying about it after that:
https://f95zone.to/threads/how-to-install-japanese-language-pack-on-win-10.100711/