title: openWithDefaultApplication fails on files in application folder
body: <p>I'll ONLY recieve an "Error #3000: Illegal path name" if I try to open a file which is placed inside the app-folder of the air. If the file is somewhere else outside of the app-folder it works.</p>
  
  <pre><code>private var file:File = File.documentsDirectory; 
  
      public function download():void{
          var pdfFilter:FileFilter = new FileFilter("PDF Files", "*.pdf"); 
          file.browseForOpen("Open", [pdfFilter]); 
          file.addEventListener(Event.SELECT, fileSelected); 
      }
  
      private function fileSelected(e:Event):void 
      { 
          var destination:File = File.applicationDirectory
          destination = destination.resolvePath("test.pdf");
          /*
          //This works, also if the file to copy is placed inside the appfolder
          file.copyTo(destination, true);
          */
  
          /*This Throws me an Error #3000, but ONLY if the file is located in
          the App folder*/
          file.openWithDefaultApplication();
  
      }
  </code></pre>
  
  <p>When i try to get the same file and copy it to another place it's doing fine.</p>
  
  <p>Why that? Something special to do if i wanna open files which are inside the appfolder?
  It also don't work in debug mode - bin-debug.</p>
  
  <p>Regards, Temo</p>