ExportDataObject fails: "invalid action object"

Question

Simple operation: I have a help file attached to the main PDF form.
All I want to do is open it once upon opening of the form.
I call the below function from the init procedure in the main form, but it fails.
What am I doing wrong ? The file name is "Test Help File.pdf".
function OpenAttachedHelpFile(pszFilename)
/* Open the attached help file unless it's already open */
  app.beginPriv();
  var oDoc;
  if ( !IsDocOpened(pszFilename) )
    try
    { // now open the attachment in a temp folder
      oDoc = this.exportDataObject({cName: pszFilename, nLaunch: 2}); // always reference the parent document; 2=launch in system temp folder
    } catch ( e )
      ShowError(e.message + "\c Path was \'" + szFilePath + "\'", 0);
    try
      oDoc = app.openDoc({cPath: szFilePath, bHidden: false});
    catch ( e )
      app.alert('Error in app.openDoc: \'' + '\'' + szFilePath + e.message);
  return oDoc;  // return a reference to the help file
  app.endPriv();
app.trustedFunction(OpenAttachedHelpFile);

Answer 1

re:"Have you put this script in the startup folder?"
Absolutely.
I even tried using the openDataObject method to get the path of the attachment (which is specially encoded),
and then open it with openDoc. That failed on a security error.
Something strange is occurring here.