[blablabla123]

Even if you use open formats, if it's a web app it's not unlikely that it has a server side dependency. For single user flash apps it's uncommon not to be self-contained. So actually it's a requirement as well that the source code and the assets are open.

[miedpo]

I used to do some Flash Game Developmemt. My gut tells me that most games had game assets that are self contained. It's a lot easier to author an SWF that way (from my own experience).