I see that there is a similar question here, but it does not mention 404's:

<http://forum.httrack.com/readmsg/24460/index.html>

It looks now that I am mistaken and the 404 is unrelated to the .html
appending. It looks that the problem lies with DMOZ, and not with HTTrack at
all.

I am sorry for accusing HTTrack!

Could anyone suggest a way to download DMOZ? Could anyone download DMOZ for
me, and I will pay for it? my email is frank@moyogo.com

I already downloaded the DMOZ structure files, but parsing them is a major
undertaking, so I very much would like to download the entire site. This is
for a major commercial project, so I can and will pay to get this solved.