Excel 95 and later file converter
http://chicago.sourceforge.net/xlhtml/

xlHtml is an Excel 95 and later file converter. Its html output can be
used as a Netscape Plug-in to let you view xls e-mail attachments. It
can also extract regions of a spreadsheet and convert the spreadsheet
to pure text rather than html.

Authors
Roberto Arturo Tena Sanchez <arturo@directmail.org>
Andrew Scriven <andy.scriven@research.natpower.co.uk>