How do you open Excel from a link in ASP?

We're working on an intranet. There is a XLS document that my users have access to but I want to put a link on an ASP page that will open the Excel and the actual Excel file.

I DO NOT want them to click on the link and save it locally. I wanted it to open from the UNC path and when they hit save, it saves in the same place.

Is it possible? I tried "file://///" but it doesn't provoke anything when you click on it.

Can I open the file within the browser and have it save exactly where it came from?

Your help is appreciated.