title: AIR: securityError on OSX (but not on Windows) with URLStream()
body: <p>I'm using URLStream to load a file from the harddisk (and I'd like to continue to use URLStream to do so). The file is located in "app-storage:/myfolder/myFile.zip"</p>
  
  <p>so I use</p>
  
  <pre><code>var f:File = new File("app-storage:/myfolder/myFile.zip");
  myStream.load(new URLRequest(f.nativePath));
  </code></pre>
  
  <p>on Windows this seems to work without problems - but on OS X the URLStream dispatches a SecurityErrorEvent.SECURITY_ERROR with the message:</p>
  
  <pre><code>Error #2032: Stream Error. URL: app:/Users/myUserName/Library/Preferences/MyAppName/Local%20Store/myfolder/myFile.zip
  </code></pre>
  
  <p>can someone explain me why this works on windows but not on OS X and how to resolve this issue?</p>