I suggest a more mac-centered forum to answer that one. I was under the impression the .itc files were cover art.
Synced my iPhone 3gs with iTunes but that deleted all contacts on my phone. I have found what seems to be the back up of the contacts in Finder on my Mac, but can not open them to view them I just get a message saying, There is no application set to open the document "099EB3AA6D79F04E-6CED893471992BJS1.itc". Help needed asap!