Microsoft AppLocale Utility

"Unicode based platforms, such as Windows XP, emulate the language environment required to run non-Unicode applications by internally converting application's non-Unicode text data to Unicode using a system-wide variable commonly called the system local (or language for non-Unicode applications). The language of the non-Unicode applications should be of the same script or family as the one defined by the system locale. Failing to meet this condition results in display of garbage characters in the UI of the application."

Bink.nu - Microsoft AppLocale Utility