here is my code :

public String download(){
        if(log.isDebugEnabled()){
           log.info("Entered for downloading: ");
        }
        FacesContext facesContext = FacesContext.getCurrentInstance(); 
        ExternalContext externalContext = facesContext.getExternalContext(); 
        HttpServletResponse response = (HttpServletResponse) externalContext.getResponse();
        try{
            List<TableController> list = fetchTechniciansList();
            Iterator<TableController> iter = list.iterator();
            ServletOutputStream out = null;
            response.reset();`print("code sample");`
            response.setContentType("application/csv"); 
            response.setHeader("Cache-Control", "private"); 
            response.setHeader("Pragma", "public");
            response.addHeader("Accept-Ranges", "none");
            response.setHeader("Content-disposition","inline; filename=\""
                + "technician_list.csv" + "\"");
            out=response.getOutputStream();
            out.write("First Name".getBytes());
            out.write(',');
            out.write("Last Name".getBytes());
            out.write(',');
            out.write("User ID".getBytes());
            out.write('\n');
            Integer i=0; 
            while(iter.hasNext()) {             
                out.write(list.get(i).getFirst_name().getBytes());
                out.write(',');
                out.write(list.get(i).getBean_last_name().getBytes());
                out.write(',');
                out.write(list.get(i).getUser_id().toString().getBytes());
                out.write('\n');
                i++;            
                iter.next();
            }       
            out.flush();
            out.close();
            facesContext.responseComplete();


        }
        catch (Exception e) {
            // TODO: handle exception
            log.error("downloading error");
            log.info("Exited");
        }
        return null;
    }

I have command link in html :

<h:commandLink value="Download Technician List" action="#{tableControllerBean.download}" style="float:right" target="_blank"></h:commandLink>

which calls this download() method . the problem is that list open directly in excel file but not in IE . I am using IE 8 with windows 7.