snd:Sound = new Sound;
snd.attachSound('snd1')

.
.  
var loader:Loader = new Loader()
var req = new URLRequest("wndw_as3.swf");
    loader.contentLoaderInfo.addEventListener(Event.COMPLETE,compl)
    loader.load(req);
addChild(loader);

function compl (e:Event) {
loader.contentLoaderInfo.removeEventListener(Event.COMPLETE,compl);
var mco=loader.content;
var _content:MovieClip = loader.content as MovieClip;
var mc_copy:MovieClip = newCopy(_content);
   mc_copy.x=100
   mc_copy.gotoAndStop(1)
addChild(mc_copy)   
}
function newCopy (mc:MovieClip):MovieClip {
   var classRef:Class = mc.constructor;
   var copy = new classRef();
return copy;
.
.
}

private var mainTimeline:MovieClip;
    
       [Embed(source = "wndw_as3.swf", symbol = "okno")]
       private var ramka: Class;
        
       private var oknoa: MovieClip;
    
   public function SimplePreloader()
   {
    init();
   }
   
   private function init():void
   {
    addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
     
    this.oknoa = new this.ramka() as MovieClip;
    this.addChild(this.oknoa);
   }