Hey,
try following code to convert html to word
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.Charset = "";
HttpContext.Current.Response.ContentType = "application/msword";
string strFileName = "GenerateDocumentfgfgfg" + ".doc";
HttpContext.Current.Response.AddHeader("Content-Disposition", "inline;filename=" + strFileName);
StringBuilder strHTMLContent = new StringBuilder();
strHTMLContent.Append(RadEditor1.Content);
-- RadEditor1.Content is HTML Text I m taking it from editor.
HttpContext.Current.Response.Write(strHTMLContent);
HttpContext.Current.Response.End();
HttpContext.Current.Response.Flush();
Best Luck
Happy Coding :)