text: Flash Player 9 and later, Adobe AIR 1.0 and
  later
  Considerations for loading an older SWF file
  In ActionScript 3.0, SWF files
  are loaded using the Loader class. To load an external SWF file,
  your ActionScript needs to do four things:.
  Ultimately, the code looks like this:
  var request:URLRequest = new URLRequest(".[yourdomain].com/externalSwf.swf");
  var loader:Loader = new Loader()
  loader.load(request);
  addChild(loader);
  This same code can be used to load an external image file such
  as a JPEG, GIF, or PNG image, by specifying the image file’s url
  rather than a SWF file’s url. A SWF file, unlike an image file,
  may contain ActionScript. Thus, although the process of loading
  a SWF file may be identical to loading an image, when loading an external
  SWF file both the SWF file doing the loading and the SWF file being loaded
  must reside in the same security sandbox if Flash Player or AIR
  is playing the SWF and you plan to use ActionScript to communicate
  in any way to the external SWF file. Additionally, if the external
  SWF file contains classes that share the same namespace as classes
  in the loading SWF file, you may need to create a new application
  domain for the loaded SWF file in order to avoid namespace conflicts.
  For more information on security and application domain considerations,
  see Working with application domains and Loading content.
  When the external SWF file is successfully loaded, it can be
  accessed through the Loader.content property. If
  the external SWF file is published for ActionScript 3.0, this will
  be either a movie clip or a sprite, depending on which class it extends.
  There are a few differences for loading a SWF file in Adobe AIR
  for iOS versus other platforms. For more information, see Loading SWF files in AIR for iOS.
  If
  the external SWF file has been published with an older version of
  ActionScript, there are important limitations to consider. Unlike
  an ActionScript 3.0 SWF file that runs in AVM2 (ActionScript Virtual
  Machine 2), a SWF file published for ActionScript 1.0 or 2.0 runs
  in AVM1 (ActionScript Virtual Machine 1).
  There
  are important differences when loading an ActionScript 1.0 or 2.0
  SWF file into an ActionScript 3.0 SWF file (compared to loading
  an ActionScript 3.0 SWF file). Flash Player provides full backward
  compatibility with previously published content. Any content that
  runs in previous versions of Flash Player runs in Flash Player versions
  that support ActionScript 3.0. However, the following limitations apply:
  ActionScript 3.0 code can load a SWF file written in
  ActionScript 1.0 or 2.0. When an ActionScript 1.0 or 2.0 SWF file
  is successfully loaded, the loaded object (the Loader.content property)
  is an AVM1Movie object. An AVM1Movie instance is not the same as
  a MovieClip instance. It is a display object, but unlike a movie
  clip, it does not include timeline-related methods or properties.
  The parent AVM2 SWF file cannot access the properties, methods, or
  objects of the loaded AVM1Movie object., suppose newer content and executing
  code, as well as the limitations for cross-scripting between SWF
  files written in different versions of ActionScript.
  Supported functionality
  Flash Player 7
  Flash Player 8
  Flash Player 9 and 10
  Can load SWFs published for
  7 and earlier
  8 and earlier
  9 (or 10) and earlier
  Contains this AVM
  AVM1
  AVM1 and AVM2
  Runs SWFs written in ActionScript
  1.0 and 2.0
  1.0 and 2.0, and 3.0
  In the following table, “Supported functionality” refers to content
  running in Flash Player 9 or later. Content running in Flash Player
  8 or earlier can load, display, execute, and cross-script only ActionScript
  1.0 and 2.0.
  Content created in ActionScript 1.0 and
  2.0
  Content created in ActionScript 3.0
  Can load content and execute code in content created
  in
  ActionScript 1.0 and 2.0 only
  ActionScript 1.0 and 2.0, and ActionScript
  3.0
  Can cross script content created in
  ActionScript 1.0 and 2.0 only (ActionScript
  3.0 through Local Connection)
  ActionScript 1.0 and 2.0 through LocalConnection.
  ActionScript
  3.0
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