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Jun 25, 2015 4:42 PM in response to KaylaCTby a brody,First off, there is no version of Classic operating system that will open a newer Excel 2008 or newer file.
You posted to the Classic forum. If you are indeed running Mac OS X 10.7.5, you posted to the wrong forum.
xlsx typically is Excel 2010 or later. LibreOffice, NeoOffice, and OpenOffice have almost free and free versions that will open newer versions which you can try if you have Mac OS X 10.7 or later. MacBook Pros can't run Classic operating systems either.