To enable Mutt to display Excel attachments, follow these steps.1.  Make sure the following programs are in a directory in your PATH:	excel2text	xlhtml	w3m	<http://ei5nazha.yz.yamagata-u.ac.jp/~aito/w3m/eng/>2.  Add these lines to Mutt's mailcap file:	application/excel;		excel2text %s; copiousoutput	application/ms-Excel;		excel2text %s; copiousoutput	application/msexcel;		excel2text %s; copiousoutput	application/vnd.ms-excel;	excel2text %s; copiousoutput	application/x-excel;		excel2text %s; copiousoutput	application/x-msexcel;		excel2text %s; copiousoutput3.  To have Mutt automatically expand Excel attachments in-line, in    addition to being able to view the attachments from the attachments    menu, add these lines to Mutt's configuration file (e.g.,    ~/.muttrc):	auto_view application/excel application/ms-Excel	auto_view application/msexcel application/vnd.ms-excel	auto_view application/x-excel application/x-msexcel