title: How can I set a file to be writeable by all users?
body: <p>I want to set a file to be writeable by all users.</p>
  
  <pre><code>FileSecurity sec = File.GetAccessControl(fileName);
  
  string users = ?????;
  sec.AddAccessRule(new FileSystemAccessRule(
          users,
          FileSystemRights.Write, 
          AccessControlType.Allow));
  
  File.SetAccessControl(fileName, sec);
  </code></pre>
  
  <p>The problem is that I don't know which string to use. I have tried <code>users = WindowsAccountType.Normal.ToString()</code>, but that only gives <code>"Normal"</code>, which doesn't work. How can I get the string that designates the group of all users on a machine?</p>