To fix the Excel file format does not match extension error, trying opening the spreadsheet with the Open and Repair option or changing its file extension.

Every now and then, when I try opening an Excel file, I get a message saying that "Excel cannot open the file 'file.xlsx' because the file format or the file extension is not valid. Verify that the ...

2. Select Manage Workbook > Recover Unsaved Workbook . Excel file recovery options 3. From the list of files displayed, open the inaccessible file and save it. Solution 7: Open MS Excel in Safe Mode ...

Is there a way to configure Angular File Saver to export an html web page to an excel file, without having to see this error message from excel? (And do it without having to set the user's Excel ...