title: Registry.LocalMachine.OpenSubKey() returns null
body: <p>I get a null back from this attempt to access the Windows Registry:</p>
  
  <pre><code>using (RegistryKey registry = Registry.LocalMachine.OpenSubKey(keyPath))
  </code></pre>
  
  <p>keyPath is <code>SOFTWARE\\TestKey</code></p>
  
  <p>The key is in the registry, so why is it not finding it under the Local Machine hive?</p>