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The Simplest Ways to Open, Edit, and Convert XLSX Files

You don't necessarily need Microsoft Excel to work with an .xlsx file Reviewed by Ryan Perian This article explains what XLSX ...
How-To Geek on MSN

LibreOffice says your documents should survive for 'generations'

LibreOffice and other office suites are built around the Open Document Format, or ODF for short, which has a few important ...