Вот что выводит Output:
**Error** Scene=Scene 1, layer=action, frame=1:Line 5: The class 'flash.net.FileReference' could not be loaded.
listener.onSelect = function(file:FileReference):Void {

**Error** Scene=Scene 1, layer=action, frame=1:Line 9: The class 'flash.net.FileReference' could not be loaded.
listener.onCancel = function(file:FileReference):Void {

**Error** Scene=Scene 1, layer=action, frame=1:Line 13: The class 'flash.net.FileReference' could not be loaded.
listener.onOpen = function(file:FileReference):Void {

**Error** Scene=Scene 1, layer=action, frame=1:Line 17: The class 'flash.net.FileReference' could not be loaded.
listener.onProgress = function(file:FileReference, bytesLoaded:Number, bytesTotal:Number):Void {

**Error** Scene=Scene 1, layer=action, frame=1:Line 21: The class 'flash.net.FileReference' could not be loaded.
listener.onComplete = function(file:FileReference):Void {

**Error** Scene=Scene 1, layer=action, frame=1:Line 25: The class 'flash.net.FileReference' could not be loaded.
listener.onIOError = function(file:FileReference):Void {

**Error** Scene=Scene 1, layer=action, frame=1:Line 29: The class 'flash.net.FileReference' could not be loaded.
var fileRef:FileReference = new FileReference();

Total ActionScript Errors: 7 Reported Errors: 7

Дык публикуйте под 8-ку или выше.

глупость бывает безграничной. у меня версия Macromedia Flash Mx Professional 2004 v.7(((