hi, I have some questions about quicktime player. I got 1 pc and 2 macs. All of them have divx, vlc, and quicktime installed. The problem is that I tested all 3 comps with the same mpg or mp4 files. And i found out that the pc and 1 of the mac can't play any of them with quicktime. everytime i try opening the files with quicktime a window pops out n said "An invalid public movie atom was found in the movie." But if i use vlc player then theres no problem. the odd thing is that with my other mac it can play the same file with quicktime. so i donno whats the deal here Anyone knows why?