> Hi.  I have a site with a directory like this:
> www.foo.com/bar/stuff/ 
There is no magic here. If your browser can see the directory, so can HTT. If
not, sorry.
> 
> www.foo.com/bar/stuff/onefile.html  
> 
> I tried to run httrack on the domain
> www.foo.com/bar/stuff/* but that didn't work. 
Of course not, that is not a valid url.

HTT does not guess. It only follows what is in the starting page. Give it a
valid starting url.