Does anybody use Excel application? I installed it yesterday. Tried to open .xlsx extension document which was e-mailed to me.
But the document showing a warning message "Unknown format." Is there another way to open this doc?

11 minutes ago, gregg928 said:

Does anybody use Excel application? I installed it yesterday. Tried to open .xlsx extension document which was e-mailed to me.
But the document showing a warning message "Unknown format." Is there another way to open this doc?

Do you have at least excel 2007?

What version of excel are you running?

Maybe the workbook is corrupted? You could try:

File -> Open 

In the Open dialog box select the corrupted workbook.

Click the arrow next to the Open button and click Open and Repair

 

Edited September 27, 20178 yr by Explv

Have you tried using Open Office? There are also plenty of other word-processing programs that can work with Word files (e.g. XLSX Viewer Tool , LibreOffice).