private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed
        JFileChooser fichero = new JFileChooser();
        int opcion = fichero.showOpenDialog(this);
        if(opcion == JFileChooser.APPROVE_OPTION)
        {
            this.jTextField3.setText(fichero.getSelectedFile().getPath());
            this.rutaProgramaExterno = this.jTextField3.getText();
        }
    }//GEN-LAST:event_jButton3ActionPerformed