Follow the steps below to set Japanese locale. It is quite specialized in what it does and may appeal only to a small audience, and it may not work in all cases, but it is small, open source, and should work in the majority of cases. You may use a locale emulator, though it is less of a hassle to just change system-wide locale in my opinion. Locale Emulator is a handy program for users who want to run programs designed for specific locales. You may then use the 'run as other user' option to run programs that refuse to work properly under your main account. What you can do in this case is create other user accounts on the operating system, and switch the locales for these accounts to the desired one. This is the case for the aforementioned 64-bit programs for instance which the program won't emulate another locale for. Some programs may refuse to run, and there is little that you can do about that. Locale Emulator works fine in many cases, but not in all. For example, if you play a Japanese game in English Windows. The development focus is Windows 10 however. Just launch the Locale Emulator, set your OS language to that of the country-specific game. The application itself is compatible with all versions of Windows starting with Windows 7 Service Pack 1.

It runs 32-bit programs on 32-bit and 64-bit systems fine, but does not support 64-bit programs on 64-bit systems. One shortcoming of Locale Emulator is that it does not support native 64-bit programs.

Japanese locale emulator download