How to set firefox Preferences to work File types and downlo

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxProfile;


public class FileDownloadFFsetPreference {
    public static void main(String[] args) {
        FirefoxProfile myTestProfile = new FirefoxProfile();

        myTestProfile.setPreference("browser.download.folderList", 2);

        myTestProfile.setPreference("browser.download.dir","C:\\Test");
        myTestProfile.setPreference("browser.helperApps.neverAsk.saveToDisk",
                "application/x-jar,application/application/vnd.android.package-archive,application/msword,application/x-rar-compressed,application/octet-stream,application/csv,text/csv");
        WebDriver myTestDriver = new FirefoxDriver(myTestProfile);
        myTestDriver.get("http://onlineseleniumtraining.com/downloads/");
        myTestDriver.findElement(By.xpath("//*[@id='downloads']/a")).click();
        myTestDriver.findElement(By.xpath("//*[@id='downloads']/p[2]/a")).click();

        myTestDriver.findElement(By.xpath("//*[@id='downloads']/p[3]/a")).click();
        myTestDriver.findElement(By.xpath("//*[@id='downloads']/p[4]/a")).click();

    }

}