When you first installed Microsoft Excel, it should have registered itself as the default program for opening compatible file types, such as .xlsx or .xls. Installing other spreadsheet programs ...

If Excel is not set as the default application to open the Excel file types (.xls, .xlm, .cvs, etc.), the file may open in another application. Press Win+I key combinations to open Windows Settings.

Excel users who have been using the platform for over a decade would be aware of the .xls file extension from back in the day. Over the years, newer versions of Excel started using the .xlsx ...

Microsoft is making an important change to Excel to prevent attackers from spreading malware or phishing campaigns.

Excel displays a warning message that the file format and extension don’t match (HTML table and XLS), but allows the user to open the file anyway. Today, users reported that these reports no ...

Even files saved as "Excel 97-2003" from Excel 2007 may lose features when you re-save them from Excel 2003. For the best file compatibility, you should make changes using the same version of ...

The Excel team has made a change in the behavior of certain file types to increase security. This change came in the security updates KB3115262, KB3170008, and KB3115322.