Batch Print Modification in osC - PDF to Excel

I have an online shop using osCommerce. It has a Batch Print function that i can download packing slips and invoices in batches. However, i can only download it to PDF. I need to be able to download it to Microsoft Excel, while retaining the format and should be fully editable. I will not accept anything less. Only those who are confident to help me do this should bid. Thanks.