I recently upgraded VLC and Quicktime, and now older AVI files that have been previously playable are not. This is not ALL of my previously-working AVIs-- but a lot of them, for sure. I have tried deleting the VLC folder and VLC prefs .plist file from the LIbrary folder, and downloaded and installed Perian. I usually just open all my movie files in VLC, but when I try these older ones they either don't work or play what I believe to be a random song from my iTunes. When I try to open them in Quicktime, I'm given a OSStatus error -50. Any help would be VERY, VERY appreciated.