import flash.events.*;
import flash.net.URLLoader;
import flash.net.URLRequest;
import fl.controls.TextArea;
 
var fileLoader:URLLoader;
var yourTextArea:TextArea = new TextArea();
addChild(yourTextArea);
 
loadFile("your_text_file.txt");
 
 
 
 
function loadFile(url:String) {
	fileLoader = new URLLoader();
	fileLoader.addEventListener(IOErrorEvent.IO_ERROR , onFileLoadError);
	fileLoader.addEventListener(Event.COMPLETE, onFileLoadComplete);
	fileLoader.load(new URLRequest(url));
}
 
function onFileLoadComplete(event:Event):void {
	fileLoader.removeEventListener(Event.COMPLETE, onFileLoadComplete);
	fileLoader.removeEventListener(IOErrorEvent.IO_ERROR , onFileLoadError);
	yourTextArea.htmlText = event.target.data as String;
}
 
function onFileLoadError(event:IOErrorEvent):void {
	trace("Could not load text ");
}