saving an excel file from the server

hi i have a excel file stored on the webserver, what is the best way do have a onclick which opens up a save as box?

i have tried this but get file not found, but the file is there

<cfheader name="Content-Disposition" value="inline; filename=Template.xls">
<cfcontent type="application/vnd.ms-excel" file="siteurl/Template.xls">