> to "Original URL / Original URL" and adding a mime
> association of "iso -> application/x-iso"), but
> nothing I've done so far has worked.

The web site is broken:
> >>> Content-Type: text/plain; charset=UTF-8

The mime type should have worked but the latest build 3.41-2 is broken
<http://forum.httrack.com/readmsg/15842/15782/index.html>
I've gone back to my standby 3.32