When you say After Effects version 6, do you actually mean version 6 or do you mean CS6 (which is version 11)?
If you mean CS6, what is the full version number? Is it 11.0.4? If not, update to 11.0.4.
If you actually mean version 6, you're probably out of luck. It would be unlikely that such an old version would be able to handle modern codecs and formats.
I meant CS6 with version 188.8.131.52 !
Premiere works just fine with the files !