Well, first of all, make sure the files you're extracting is also done in Japanese and not unicode. Otherwise, it's not going to work no matter what locale or emulators you use. Your default extraction settings may be setting it to unicode without you knowing. Secondly, leaving your computer on Japanese locale shouldn't affect it too much. I've had mine on Japanese locale for over 5 years. The backslash symbol sometimes appears a yen symbol, but that's about it.
In my experience, if almost no one else has the same issue, 90% of the time it's because of user error. If it's not an issue of extraction or locale, the only other thing I can think of is that the antivirus is quarantining something essential to the game.
yeah i dunno i tried a locale emulator nothing happend and the exe application was sending me an error code that i should report to github so gave up on that, then i tried manualy changing the region to japan from windows settings. it would let me open the game to the main menu look around at empty saves and stuff but as sooon as i pressed start it would error code and stay on a blank screen
