Hey guys, got this off of Were-Here, you can program flash MX actions in flash 5. All you need to do is use flash 5 to make your MX actions, then open the swf in a hex editor, and change:
4657 5305 FWS.
into
4657 5306 FWS.
Then open it with the flash 6 player, and it works!
Great hint! Maybe someone will make a program to enable those Flash 5 developers to build Flash 6 contents without really having a copy of Flash 6. But Macromedia will hate to see this happen.