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2. List of Microsoft Office filename extensions - Wikipedia

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

   .xlt – Legacy Excel templates; officially designated "Microsoft Excel 97–2003 Template".xlm – Legacy Excel macro; OOXML Office Open XML (OOXML) format was introduced with Microsoft Office 2007 and became the default format of Microsoft Excel ever since. Excel-related file extensions of this format include:.xlsx – Excel workbook