One of my teachers has several pages with the extensions .txt instead of .html,
but everything in the .txt files is html code.

the webpage that I am trying to copy is
<http://faculty.washington.edu/jrras/CSS458.TXT> if you would like to test or
check out what I am talking about.

I would like WinHTTrack to change all of the .txt or .TXT to .html. Is this
possible? I don't want it to just change the files themselves, but if there
are any links like in the file it would also change the extensions so all the
links line up.

Note: I was able to get it to treat all the files as .html so it would
download all the links (using MIME types). but the extensions and links are
still .txt