XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.
What are the differences between the two formats and why would you want to use one over the other? From what I've read about so far it seems that: - XLSB files are smaller than XLSX - XLSB sometimes ...
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