XP & 2000 users make a note – if you've ever wondered how to back up your WMP Media Library, here it is.
There are two files that need to be copied to create a backup: CurrentDatabase_59R.wmdb and wmpfolders.wmdb.
They exist in hidden folders along this path:
C:\Documents and Settings\UserName\Local Settings\Application Data\Microsoft\Media Player
Just replace the UserName above with your correct user name and you shouldn't have any trouble finding the files. Your CurrentDatabase_59R.wmdb may be pretty big depending on the number of songs/albums in your Windows Media Player. My file is about 15MB.
Remember – when making backups – do not put the backup on the same drive as the original file. Put it on a network drive or a removable media, like a dvd-r or a cd-r.