> WinHTTrack just grabs all .php files and converts
> them to html or to tmp.html. 
You can NOT get php, cgi or any other server side code from the public side of
a web server, just the html OUTPUT and referenced files. HTT isn't converting
anything.

> All videos ord pictures
> that are linked on those file are not (yet)
On most sites, the only thing listed is a small swf file which HTT gets just
fine. It is the swf that downloads and displays the video. In a mirror the swf
tries to open the video from your machine which doesn't exist.
Try extended parsing. If there are links passed to the swf it'll work. Most
likely no.