It's a ZIP-compressed, XML-based spreadsheet file created by Microsoft Excel version 2007 and later. XLSX files organize data in cells that are stored in worksheets, which are in turn stored in ...

Microsoft didn't invent the electronic spreadsheet ... often allow you to export to either .xls or .xlsx format when moving the data to Excel, and Microsoft's application will work with either.

Doing so will also prevent the workbook from recalculating the values and this can make file accessible. For this, Click on ‘File’ menu of Excel ribbon ... want to recover data from the ...