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How to make my excel spreadsheet save as a .xlsx file

  1. Open your Excel file: Launch Microsoft Excel and open the Excel file you want to convert.

  2. Save As: Click on the "File" menu at the top-left corner of the Excel window.

  3. Choose Save As: In the drop-down menu, select "Save As". This will open a dialog box.

  4. Choose File Format: In the "Save as type" dropdown menu at the bottom of the dialog box, select "Excel Workbook (*.xlsx)".

  5. Click Save: Once you've chosen the file format and provided a name, click the "Save" button. Your Excel file will be saved in the .xlsx format.

By following these steps, you can convert your Excel file to the .xlsx format using Microsoft Excel.