InfoPath Dev

Hi All

I have an InfoPath 2007 request form with Workflow(WWF) on my MOSS 2007 portal site.In my InfoPath form i have an Excel spreadsheet attached which gets submitted to a specified document library when the request is submitted with a link in the InfoPath form. Next time when i tries to open the link , it prompts me to save and cancel the Excel sheet instead of giving a chance to edit.

Is there any option to do it on the server side to edit the Excel sheet even without a prompt to any user having full control. I am able to do it if i do some changes in the browser settings in my client machine. But it does not suit my requirement .

Any help is appreciated.