import flash.net.FileReferenceList;
var fileRef:FileReferenceList = new FileReferenceList();
var allTypes:Array = [];
var 瀏覽類型:Object = new Object();
瀏覽類型.description = "瀏覽類型(*.mp3)";
瀏覽類型.extension = "*.mp3";
allTypes.push(瀏覽類型);
fileRef.browse(allTypes);