>If HTTrack requires HTML files in order to 
> identify my required file types this is why it's 
> redownloading the HTML files even though I'm deleting 
them 
> and have the 'Don't re-download locally erased files' 
> option?
I'd guess that's probably the reason...

> Could you explain the purpose of the 'Store non-
> HTML files' option in Experts Only? Thanks, dnt

Search for the term 'non html' in Fred Cohen's guide:
<http://www.httrack.com/html/fcguide.html>
There are a few entries about this, but not very much.

For your original request, just use the Build options tab 
to change the build structure to one of the options that 
puts html in a different place than images (approx options 
2-6 or so, with option 1 being the default)