using System.IO;

class ReadProg {
  static void Main() {
    Stream s = new FileStream("myFile.bin", FileMode.Create);
    s.WriteByte(79);  // O    01001111
    s.WriteByte(79);  // O    01001111
    s.WriteByte(80);  // P    01010000
    s.Close();
  }
}