File Format → Add/Remove… > XLS format in all columns as shown in below picture. After clicking XLS format, next click Export on the File ‹Workbook‹ > ‹File Header‹ tab, and after creating a new document (it might not work with Excel 2013), select the new sheet as your workbook and in the right column enter the column number that shows up as the XLS format, and click Convert. Then follow the steps given here: How to export XLS file from workbook?. 2. Convert all your XLSX files in the workbook to the other one format. Step 1: Choose a workbook for quick conversion and open a new workbook. Choose a workbook for quick conversion and open a new workbook. Step 2. Right-click on the workbook on the left column of the workbook to make it the active workbook. Step 3. Click the ‖ Add ‹ XLS” to ‹Workbook‹ button, click Convert” to convert your workbook to XLS format. Converters available for XLSX conversion. Please choose the application from the list to add in the list below: Conversions for converting .xlsx workbook to .xls format in Excel. To get started, kindly perform the following steps: Open File Explorer. Go to the View Tab. Tick File name extensions under Show/Hide. Go to the folder where you Excel file is stored. Right-click on the Excel File. Select Rename. Rename “. XLSX” to “. XLS”. Click Enter once done. More items Converting XLSX to XLS quickly and easily — IONS Aug 25, 2022 — Open the XLSX file you want to convert. · In Microsoft Excel, go to the File tab located at the top left. · Click on the “Save as” option and Convert your XLSX to XLS for Free Online — Lamar Choose the XLSX file that you want to convert. Select XLS as the format you want to convert your XLSX file to. Click Convert → ‐ ‐ ‐. Step 1.