You should not mess with system files in that way. However I have discovered a very easy method to archive exactly what you want. I thought the way you apply a language to a "Multilanguage OS" were limited to a Multilanguage installation. This is however not true - it can be applied to ANY install !!! (Maybe limited to english OS, I have not yet tried). In this case, you need a language package for Windows XP and I can confirm that this works perfectly on MCE 2005, but it might be slightly difficult to find these packages, as they are of course only supplied with "Multilanguage OS'es", but use your imagination . Also I think that there might be some licensing trouble, but my personal oppinion is that I think these packages should be free for everybody (or even included in every release). ...oh just one thing: the MCE application itself are still english, as the language package only affects the system.