importDataObject in Adobe Reader

Hello Alll,

i have a PDF-Form created in Acrobat Pro 8.
In this form there is a Dropdown-List, its options are imported by an XML-File, the user can attach.

This works fine in Acrobat but unfortunately not in Adobe Reader due to security settings. The Document is Usage-Richtgs enabled and the XML-File should be attached per Button-Javascript, that calls a folder-level trusted function.
See code below:

Button on mouseup:
trusted_importXML();
The trusted functions stored in 'Program Files/../../../Javascripts/':

trusted_importXMLData = app.trustPropagatorFunction(
  function(oDoc)
	{
    app.beginPriv();
		  oDoc.importDataObject("Anhang");
		app.endPriv();
	}
);
trusted_importXML = app.trustedFunction(
  function(oDoc)
	{   
    app.beginPriv();
		  trusted_importXMLData(this);
		app.endPriv();
	}
);

NotAllowedError: Sicherheitseinstellungen verhindern den Zugriff auf diese Eigenschaft oder Methode.
Doc.importDataObject:6:Field Schaltfläche1:Mouse Up