I think i have the same problem ,i cant open anything sent (as attachment
with e mail )with the .xlsx extension
only way i found was save it to my documents ,then open up office 2007 exel,
open my documents from there, down to bottom and choose "all Files" the
attachment i have saved then shows in there and i just open it . that works
for me but a load of soddin about !!

"Jason Sawyer" wrote:

After installing Office 2007 and the service packs (1 & 2) on WindowsXP some
of my users work just fine. Others though (and this is random), do not have
Excel associated with the .xlsx extension. If I right click and choose 'open
with...' it will not let me select Excel even if I browse to the program
within the Program Files. If I log into Windows using the admin account
everything is associated correctly but not for that user. Any thoughts or
suggestions would be greatly appreciated. I have tried several things that I
have seen on the web but have no success. Thanks.