Since Flash version 9, actions can be saved in a new format named abcFormat by the Tamarin project from the Mozilla organization.
The code itself (action script) is the same, but the structure of an swf_action3 holds object oriented information about classes, methods and such in a really clean way (really! in comparison to the old way, that's dead clean!).
At this time, the swf_action3 structure is documented in the abcFormat.html file.
I will duplicate and test the structures at a later time.