Excel Completed File Level Validation And Repair. Some Parts Of This Workbook May -

If you see this prompt, do not simply continue working. Follow these steps to ensure your data is safe:

: Save the file as an Excel Binary Workbook (.xlsb) . This format is often more robust against certain types of XML corruption. You can then save it back to .xlsx once it is stable. If you see this prompt, do not simply continue working