How exactly do I watch downloaded HD TV shows etc

[david gardner]

If I download a TV Show in HD, or some of the free HD stuff on the internet. Do I just download it as an avi, stick it on a SD Card/USB pen etc and it will play in HD or do I have to do anything else?

Also if the file is a large file 4gig plus, can I not watch it at all?

Thanks for any help. I have a lot of 24 and Lost on my PC and wonder if I can watch in in HD as originally I copied it to a DVD and the picture was poor (converted)

 

[Moogle]

Reading your post I suspect some of the stuff you're asking about is content downloaded through means not condoned by these forums. If this is not so then I apologise. Nevder the less I will have to close this thread.