[Embed(source="data.swf", mimeType="application/octet-stream")]
var data:Class;

var context:LoaderContext = new LoaderContext();
    context. parameters = { foo: "bar", test: "hello world" };

var onComplete:Function = function( event:Event ):void
{
  //done
}

var loader:Loader = new Loader();
    loader.addEventListener( Event.COMPLETE, onComplete );
    loader.loadBytes( new data(), context );