Crystal Reports

I am trying to export data to RTF type using cyrstal reports.  The rtf codes are rendered to browser instead of open .rtf file just like menttioned below

{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fswiss\fcharset0\fprq1 Gothic DP 12cpi;}}{\colortbl;\red0\green0\blue0;}{\info{\title }{\author Crystal Reports}{\doccomm Powered By Crystal}{\company Crystal Decisions}}{\*\userprops {\propname Business Objects Context Information}\proptype30{\staticval 01C2D35AF44DC8546069FCCFAB82437E8ADDB2BDEF6EFD411221E6762295156B2CE22D30E7BE430ADE6E4AC17999501C5A0B1480DDA6A2C73083D54907A06E285E0B3C9FAA956C27F8E7D927E34A7857F2A9C58A9D7571D6CE5BE294E4D036A54776E5EB530C18C97DD4809A852323EC7A1D7F539582238E73F676DD10ED23E}{\propname Business Objects Context Information1}\proptype30{\staticval

Code I used.

MemoryStream oStream;
oStream = rptH.ExportToStream(CrystalDecisions.Shared.ExportFormatType.RichText) as MemoryStream;
Response.Clear();
Response.Buffer = true;
Response.ContentType = "application/rtf";
Response.BinaryWrite(oStream.ToArray());
oStream.Close();
oStream.Dispose();
rptH.Close();