[4teras]

Я придумал такое решение:

Stage.scaleMode = "noScale";
Stage.showMenu = false;
Stage.align="TL"
fscommand ("fullscreen", true);

this.createEmptyMovieClip("image_mc", this.getNextHighestDepth());
var mclListener:Object = new Object();
mclListener.onLoadInit = function(target_mc:MovieClip) {
target_mc._x = (System.capabilities.screenResolutionX-600)/2;    target_mc._y = (System.capabilities.screenResolutionY-450)/2; 
};
var image_mcl:MovieClipLoader = new MovieClipLoader();
image_mcl.addListener(mclListener);
image_mcl.loadClip("my.swf", image_mc);
stop();

600х450 - размеры мувика который грузится