I am sure this is a divx codec or an xdiv one.
Shame its a mac u have, plays fine on the PC :p
https://www.divx.com/divx/mac/
https://www.xvidmovies.com/mac/
Enjoy
Chris (formerly R@nSiD)
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When the power of love overcomes the love of power the world will truely know peace - Jimmy Hendrix
Winner SM VFX Challenge 1
3rd Place SM SteamPunk Challenge (May 2007)