.NET C# Create a file and open it using Default Application Type

public static void OpenFileWithDefaultApplication(string fullfileLocationAndName, byte[] data)

{

try

{

System.IO.FileStream fs =   new System.IO.FileStream(fullfileLocationAndName, System.IO.FileMode.Create, System.IO.FileAccess.ReadWrite);

fs.Write(data, 0, data.Length - 1);

fs.Close();

fs.Dispose();

System.Diagnostics.Process.Start(fullfileLocationAndName);

}

catch (Exception ex)

{

MessageBox.Show("There was an error opening the file: " + ex.Message);

}

}

JAVA Open a file using the default application editor.

// Example Foo.xls will be opened with Excel
// Make sure to import the class java.awt.Desktop

public static void OpenFile(String filename){
  try{
    // Check if class 'Desktop' is supported on the platform 
    if (Desktop.isDesktopSupported()) {
      Desktop.getDesktop().open(new File(filename));
    }else{
      System.out.println("Class Desktop is unsupported");
    }
  } catch (Exception ex){
    System.out.println("Error opening "+ filename);
  }
}