[AccessD] OT: Excel 2007 size doesn't compress

I just generated an Excel spreadsheet with an XLSX file extension (new to
me).  The file is 8 megs and so I zipped it.  It shrank less than 1%.  Is
there built-in encryption or some other reason that the spreadsheet should
not compress?

John W. Colby
Colby Consulting
www.ColbyConsulting.com