7.2 upgrade: how to recover corrupted iTune library index file from backup?

Hi folks,
I upgraded to iTunes 7.2 and my library file (the xml one)
got corrupted...
My >40 GB of mysic seem to be on the safe side fortunately,
same for a half way recent backup of the file
iTunes Music Library.xml.
Both sit on an external hard drive, while the corrupted files
are on the main disk. Sounds not to bad, compared to what I read from others!
Questions:
1) How can I use my backuped XML index file to recover my playlists etc in iTunes? Unfortunately I only backuped this single index file, i.e. the "Music"
one, yet not the other iTunes database file.
2) Then, I had still made some modifications (mostly MP3 file tags)
after the backup of the index file. I realized that while looking on
the time stamps of the directories that contain my actual music.
Do I need to do something to make these modifications visible
in the recovered iTunes??
Thanks for any useful hints in advance!!

I solved my problem through a minor variation of this recipe:
http://docs.info.apple.com/article.html?artnum=93313

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7.2 upgrade: how to recover corrupted iTune library index file from backup?

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