- iTunes Library ("iTunes Library.itl" in Windows) is a database of the songs in your library and the playlists you've created. Some song-specific data is saved in this file. If you delete the file, iTunes creates a new, empty copy when you open the application, but any playlists, song ratings, comments, or other information you created will be lost. The iTunes Library file is only used by iTunes.
- iTunes Library.xml contains some (but not all) of the same information stored in the iTunes Library file. The purpose of the iTunes Library.xml file is to make your music and playlists available to other applications on your computer. If you delete the file, iTunes creates a new copy from the iTunes Library file.
\Users\username\My Music\iTunes\iTunes Library.itl
\Users\username\My Music\iTunes\iTunes Library.xml
在iTunes的icon上，按Shift+Double Clicks，就可以讓iTunes開啟使用者選擇的資料庫位址。