Have you followed aa the instructions shown on

http://support.microsoft.com/default.aspx/kb/924074?p=1

In particular update 918420

Regards

"Prashant" wrote:

Hi,

I am using Microsoft Excel 2002 (10.6852.6858) SP3. I am not able to view
files with extension xlsx. I tried with downloading Microsoft Office
Compatibility Pack for Excel 2007 after installing all High-Priority updates.
But its not working.

Please help.

Regards
Prashant