In order to repair your corrupted xlsx file, you should not open the corrupted workbook too often, since this might lead to even more damage. Firstly, try to use the built-in repair utility of Microsoft Excel, and if this is unsuccessful, you can give Notchox a try. This tool is able to scan your corrupted XLSX file, repair it and restore your worksheets, tables and other Excel data. No matter what has led to the corruption of your file, using such a utility will give you the highest chances of restoring it.