Is there a way to open a Flash file (FLA) in After Effect?, cause I saw you can open an AEP that was converted to XFL in Flash... I want to be able to open my Flash project in After Effects, same way I can import a PSD as a composition, is there a way to do that?
No, not possible. The principles are too different and it would require too many resources just to develop a conversion method. If you look closely, you will notice that even XFL is somewhat limited because of that. You can, however, still import SWF files once you are done with your work in Flash or render an image sequence from there.