I have CS5, the project is saved as uncompressed * .xfl, the structure of my project:
IDE, File- > Import- > Import to stage, ( shift) /images
. system/LIBRARY
XML (DOMDocument.xml) , ():
<DOMBitmapItem name="Buttons/menu-button!.png" ....... sourceExternalFilepath=".\LIBRARY\Buttons\menu-button!.png" ......./>
, . *.fla, ! .