erm...its a avi movie, i dont know what you mean by extension, oh wait i have imovie, it wont open there nvm, what is roxio toast 7? i will try to google taht and downoad it....oh its about 15 GB big. and its a torrent. There are small files inside it, like 300 mb and stuff like that, the episodes are all grouped in it.sorry im not being that helpful, im not very good with computer "terminology"