Disable Save Button in file download window

I have a ASP Page that allow the users to Download a File @ the Click of the button the File Download Dialog Box will pop up on the Screan ,on the download dialog Box are 4 buttons namely Open ,Save,Cancel and More Info , How do I disable Save Button on the Dialog box ?
    If anybody know the solution,tel me the process.
 
Thanks and Regards,
Archana 
 
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