.ITDB File Extension
File TypeiTunes Database File
What is an ITDB file?
Contains information about songs and other audio files stored in an iTunes Library; the files "iTunes Library Extras.itdb" and "iTunes Library Genius.itdb" are stored in the iTunes folder along with the iTunes library file.
ITDB files are generated with iTunes 8, which is the first version of iTunes to include the "Genius" feature.