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2. List of Microsoft Office filename extensions - Wikipedia

   en.wikipedia.org/wiki/List_of_Microsoft_Office...

   Excel-related file extensions of this format include:.xlsx – Excel workbook.xlsm – Excel macro-enabled workbook; same as xlsx but may contain macros and scripts.xltx – Excel template.xltm – Excel macro-enabled template; same as xltx but may contain macros and scripts; Other formats