Fix Excel Unknown Extension Problem | XLSX Not Opening 

How to Fix Excel Unknown Extension Problem in Windows | EXCEL XLSX NOT OPENING FIX
Excel's latest .xlsx extension not finding app to open issue is most common issue in Windows system. This Video shows how to fix excel 2007, 2010, 2013, 2016 .xlsx extension is unknown problem.
Operation System: Windows 7, 8, 8.1, 10
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