While on the topic of AddLanguageProfile - Vista changes the behaviour of this function.  In Windows XP, it would install the TIP across the user's currently installed languages, and just to be helpful, add Chinese (Simplified and Traditional), Japanese, and Korean languages with the TIP installed for each of those languages.  That's not too hard to fix up.  However in Vista, this simple function call will not only , but will also add every single language installed on the system to the user's profile - resulting in the following impressive dialog:

The list of languages goes on seemingly for ever.  Not only does this list every language - it also lists every sublanguage - Arabic (Saudi Arabia), Arabic (Iraq), Arabic (Egypt) and so on and so forth.  For good measure, the languages aren't installed alphabetically, but rather in the order of the language identifiers (0x0401 for Arabic (Saudi Arabia), 0x0402 for Bulgarian)...