Force Browser to Only Save File to Disk.

Question

Hi developers: Im developing an C# ASP.NET 2.0 application that has a module for downloading documents (Word, Excel). I need that user ONLY have the option to save the file to disk not to open it when the browser download dialog appears. All examples I've seen allow the user to both "open the file" or "save it to disk" without the restriction I need. Thanks in advance