> The domain is <http://user:password@mydomain.com/file.html>
> Only the file.html is downloaded - is it because, Httrack 
> needs an index.html to follow everything?
No - httrack should follow the links from this point with 
the authentication information. The only way to know what's 
going on would be to track the requests/responses (Set 
Options/Experts Only/Activate debug mode) in hts-ioinfo.txt

Any error(s) in the hts-log.txt file?