> I tried the following site: <http://www.httrack.com/>
> 
> I used the following filter:
> 
> -* +*.txt
> 
> I got no files. According to
> httrack.kauler.com/help/Filters, I should have got:
> 
> history.txt
> license.txt
> changelog.txt

There are no links by those names on the home page
Try adding +*.html so it can spider the site