Saving a file in a new browser window when sending the Response to the browser

Greetings,

  I am rendering a file as output (using Response Headers and Response.Write() to the end user and giving them the option to download and save it OR open the file.  When they click on open it is opening the file in the same browser window over the application.  Is there a way to open the file in another window or tab?  Maybe another Response header ?

Thanks in advance.