Something

var _xml:XML = new XML();
_xml.ignoreWhite = true;
_xml.onLoad = function(pSuccess:Boolean):Void  {
	if (false == pSuccess) {
		return;
	}
	txt.text = this.firstChild.toString();
	//init();
};

_xml.load("dein.txt");

// Textfile dazu dein.txt

Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.