>Although I've never used it I'd just about gaurantee that Excel has to be installed. You might look here for a better solution:
>
>http://www.aspose.com/Products/Aspose.Cells/Default.aspx

I checked this product but turned it down immediately. Their developer's licence, just for the Excel functionality if 899.00$ US. This is out of proportion.

I am checking for other products that does the same. In the meantime, if someone has another product to recommend, don't hesitate to let me know.