Article: Do so by double-clicking on the green and white app with an X, then clicking on File and Open..., and selecting the file.     Files saved in this format are considerably smaller than standard .xls files. The smaller Excel file will be saved on your computer.
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Open a Microsoft Excel file. Click File. Click Save As…. Type a file name. Click the "File Format:" drop-down. Click Excel Binary Workbook under "Specialty Formats." Click Save.