It doesn't help that i'm using Windows 10... It just makes it more confusing!
EDIT: Installed the correct runtimes and made sure they were the correct ones, used Bandzip to extract the .zip, and tried to use Locale Emulator to get it to run, and it still throws up an error message, only this time it's in actual Japanese characters!
Applocale just refuses to work correctly on my computer anyway.