You can back up the library if you want - but why are you having to rebuild
it?
http://zachd.com/pss/pss.html#medialibrary
one question down covers the back up.

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Windows Media Development Team (speaking for myself only)
See http://zachd.com/pss/pss.html for some helpful WMP info.
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> How do I backup the list (not the mp3 files them selves) that appears
> under
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>
> Thanks,
JasonA - 24 Apr 2006 23:36 GMT
Because I have had to keep re-installing XP
> You can back up the library if you want - but why are you having to
> rebuild it?
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>>
>> Thanks,