Convert XLSX to XLSB

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As both the .xlsx  and .xlsb files are from Microsoft Excel, which means the easiest way to achieve xlsx to xlsb conversion is to use the program. The reason for this is to create binary workbooks that are much faster to load. You can create a .xlsb workbook from existing .xlsx spreadsheet in Microsoft Excel with the File ► Save as... function.

Open XLSX file    Open XLSB file