If you’re working with similar file types, our how to open TGZ file guide should come in handy. For other file types, don’t miss our guide on how to unzip files on Windows 11 for more solutions. Let ...

When the file extension doesn’t match the format, changing it manually helps Excel read the file correctly. Adjusting the extension (e.g., from .txt to .xlsx) aligns the file with Excel’s expectations ...

If you cannot open an Excel file and see Excel cannot open the file because the file format or extension is not valid error, see this post.

END:VCARD What is Excel (xls/xlsx) File? It is a file format that Microsoft Excel generally creates. Up to Microsoft Excel 2003, the extension was xls, and for Microsoft Office 2007 & later, the ...

You should now see the .xlsx, .xls, or a similar extension at the end of your Excel file. Right-click on the file and select Rename. Now, alter the extension from .xlsx to .xls. If the file is in a ...

Change the file extension from XLSX to XLS or vice versa and hit Enter. Select Yes in the warning prompt that appears, and the file format will be changed. This is one of the easiest ways to convert ...