Within a website, I know that all files under a certain directory have an
".xls" extension and in another directory they are all ".pdf" but WinHTTrack
is labelling them all as ".html" files.

This is a finance professor's site:
<http://pages.stern.nyu.edu/~adamodar/New_Home_Page/>


<http://pages.stern.nyu.edu/~adamodar/pc/>
Every file here should be named with an ".xls" extension.

<http://pages.stern.nyu.edu/~adamodar/pdfiles/>...
Every file here should be named with an ".pdf" extension.

I have searched in the forum, FAQ, etc. for renaming, MIME, but none of the
suggestions worked.  What should I do?
Thanks in advance.