Detailed Instructions: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Q: Sentence: 'MUI is an add-on to the English version of Windows XP Professional and Windows 2000 family of operating systems , and will not install on localized versions ...', Argument/Subject 1: 'window xp', Argument/Subject 2: 'window'
A:
be version of