Help with htaccess

I have an old perl webmail script that works perfectly and provides a webmail service such as yahoo or gmail. It was originally sold under two brand names but became open source under the gnu licence. Both brands work well but the jilmail brand has html links that rely on a .htaccess redirect which does not work.
I assume that the way htacess files are written has changed over the years.
The actual location of a file on the server might be:
public_html/cgi-bin/inbox.htm but the html link...

Help with htaccess

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