i can download shorts movies and play them with no problem on my quicktime which is up to date but when i downloada full legth movie on mpg fomat ( which work to the short movies) it says "couldnt open the filr "(woteva the movie is)because it is not a file that quicktime understand. It is really confussing because i am downloadin on the ame format that the shorter movies usualy work on pls help me, is there a playin program i have to download????