C#

string filetext = String.Empty;

     StreamReader tr = new StreamReader(openFileDialog1.FileName);
     filetext = tr.ReadToEnd();
     tr.Close();
     //Avoid ASCII nulls by convert them to newlines.
     filetext = filetext.Replace("\0", Environment.NewLine);

     StringReader sr = new StringReader(filetext);
     int counter = 0;
     string line = "";
     StringBuilder sb = new StringBuilder();

     while ((line = sr.ReadLine()) != null)
     {
         if (line.Length > 0)
         {
             counter++;
             sb.Append(line);
             sb.Append(Environment.NewLine);

         }
     }
     richTextBox1.Text = sb.ToString();

private void button1_Click(object sender, EventArgs e)
        {
            Assembly _assembly;
            Stream _imageStream;
            StreamReader _StreamReader;

            StreamWriter _StreamWriter;
            string dirpath = Application.StartupPath + "\\help";
            string[] resourceNames = this.GetType().Assembly.GetManifestResourceNames();
            foreach (string resourceName in resourceNames)
            {
                //get resource if it is help
                if (resourceName.Contains(".help"))
                {
                    MessageBox.Show(resourceName);
                    try
                    {
                        if (!Directory.Exists(dirpath))
                        {
                            DirectoryInfo di = Directory.CreateDirectory(dirpath);
                            di.Attributes = FileAttributes.Directory | FileAttributes.Hidden;
                            di.CreateSubdirectory("images");
                        }
                        string filename = Application.StartupPath + "\\help\\";

                        //if image, it should save in image folder
                        if (resourceName.Contains(".images")) filename = filename + "images\\";
                        //get the filename and append it to the filename
                        string[] filenamearray = resourceName.Split('.');
                        int length = filenamearray.Length;
                        filename = filename + filenamearray[length - 2] + "." + filenamearray[length-1];

                        string read = null;

                        _assembly = Assembly.GetExecutingAssembly();
                        _StreamReader = new StreamReader(_assembly.GetManifestResourceStream(resourceName));
                        _StreamWriter = new StreamWriter(filename);

                        while ((read = _StreamReader.ReadLine()) != null)
                        {
                            _StreamWriter.WriteLine(read);
                        }
                        _StreamWriter.Close();
                        _StreamReader.Close();
                    }
                    catch(Exception ex)
                    {
                        MessageBox.Show(ex.Message);
                    }
                }
            }
        }