Open xlsx or xlsm in browser in ASP.NET

Hi all,
I am just trying for simple HTML page that open xlsx or xlsm file in browser, but when i open the html the file is getting opened in excel 2007 but not embed in browser (IE)..
any suggestions? Thanks
here is the html code

<HTML> <frameset rows="130,*" frameBorder="0"> <frame id="headerframe" name="headerframe" src="./headerframe.aspx"  scrolling="no" noresize>

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