Be careful ! I hope you made a copy a the AVI before changing cc code ! I once had AVI files I could read on my computer, but I didn't know with which codec. I opened them with the 4cc changer in xvid package, and I got strange 4cc codes (or no 4cc code at all). I changed them, the files became unreadable. I changed them back to their previous value, but none was readable again ! I may be wrong but I think 4cc codes have only to do with DivX. Djidjo