I cannot remember if videos are addible for iTunes 6. I think it was. But videos need to be mpeg 4 or H.264 format. AVI is not a format in itself, a little like quicktime, it could potentially be any video format inside such as mpeg2 or mpeg1, etc. http://www.gnutellaforums.com/downlo...tml#post320511

One way of re-adding the files would be simply drag & drop the iTunes Library folder onto the Library icon in iTunes, else if that does not work, choose Add folder from file menu. Depending on number of songs it could take a long time for iTunes to re-add them to it's library file database.

Come to think of it, perhaps a better idea would be to just select the iTunes Library folder in preferences as location to store the files, then go to Advanced menu & choose (cannot remember what it was called) an option which moves all files in playlists to Library. Might not even need to do that after closing & reopening iTunes.