> Would deleting the hts-log file, but keeping
> everything else in the hts-cache folder hurt the
> updating process? Or, is this just a problem that
> comes from downloading forums?
The log file is just for human consumption, wouldn't hurt anything.

Some sites have bad mime types so some videos/images may get renamed to .html

> Sorry, I am using version 3.42.

3.4x has many problem specially if your using many connections on fast
machines.

Try 3.32 and update: <http://forum.httrack.com/readmsg/17840/17833/index.html>