Hiding and Storing/caching of Application Specific data in MS Word 2003 documents

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace DocumentIDReader
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnFind_Click(object sender, EventArgs e)
        {
            //Displays the DocumentID if it exists in the file
            Program.DisplayDocumentID(txtFilePath.Text);
        }

        private void btnFileBrowser_Click_1(object sender, EventArgs e)
        {
            //Opens the fileopen dialog box.
            openFileDialog1.ShowDialog();
            txtFilePath.Text = openFileDialog1.FileName;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Adds the documentid in the file
            Program.AddDocumentID(txtFilePath.Text);
        }
    }
}