Seams to me that they are using the 1st .swf to protect the source of the other .swf from being snatched up?
Mostly I'm sure it's for loading times so the website loads real quick then opens the larger swfs.
Of course if you ripped open the 1st swf I'm sure it would show the action to open the others so then you'd see the files that it's opening?
Just a guess