title: openRawResourceFd fails on android
body: <p>I'm writing my first Android application, and I'm trying to read a <code>res/raw</code> resource file.</p>
  
  <p>The following code <code>throws</code> a <code>FileNotFound</code> Exception:</p>
  
  <pre><code>AssetFileDescriptor fd = res.openRawResourceFd(R.raw.myfile);
  </code></pre>
  
  <p>but this line of code works:</p>
  
  <pre><code>InputStream stream = res.openRawResource (R.raw.myfile);
  </code></pre>
  
  <p>I need the <code>AssetFileDescriptor</code> in order to determine the length of the file.  Any ideas why it isn't working?</p>