re-installing Itunes

Id like to reinstall Itunes, but dont want to spend hours dragging my Mp3 collection into the new installation. I know there is a small file in my existing Itunes that you can save, that will automatically re-import my collection into the new installation



However I dont know where to find it and how to save it, can you experts give me a lamens guide of how to do it :o



THANKS

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