Should really be called "export to HTML table"

This is a great idea (so two stars for trying) but not very well executed. What this plugin really does is generate an HTML table and save the file as either XLS or XLSX. Excel tries to parse most files it’s given, and it’s possible that older versions of Excel load those files quite happily. All I can tell you is that Excel 2013 barfs entirely on the XLSX-named file, and for the XLS-named one it opens the file after showing a “do you want to recover information from this corrupted file” message. So I guess you do get the data eventually if that’s satisfactory.