> Hey folks, I am trying to copy webpage for each app
> on Apple app store. 
> 
> I added <http://itunes.apple.com/us/app> to the URL
> box in winhttrack, but it does not work. The reason
> is that <http://itunes.apple.com/us/app> is not a
> valid URL. However, that is the only common part of
> the URL for each app. 
No magic here, if your browser can't read it neither can HTT.
Where did you get that link? That's where you start HTT so it can spider and
get them.

<http://itunes.apple.com/us/genre/ios-games/id6014?mt=8>