From what I can tell, there's nothing else that can open a .AEP file besides After Effects because most of the information is only usable in After Effects. The other effect and video editing software options all have a different focus than AE, so to get something that does exactly the same thing, you'd need more than one of them. I'm struggling to explain this, um, it's like using an apple slicer to open an orange I guess. They may both be fruit but the insides are very different.
Hey I'm new the RPG Maker forms as well and was having the same problem you are with needing 30 post or 30 threads we must complete. Maybe we could help each other out? Why you on the forms what is your goal?