Can't open xls files. Go to Set Default Program but the file extension isn't in the list and can't find a means of adding it. This seemed to happen after an auto Win 7 update. Any ideas?
Right-click an .XLS file and choose
Select Microsoft Office Excel from the list of "Recommended Programs", or "Other Programs", or you may have to browse for it (if it's not in either list).
Ensure you have "Always use the selected program to open this kind of file" check-marked before you hit "OK".