When you render an animation you have to set up what type of file it's going to render to (.avi, .mov etc...) I'm not sure what you mean by rendering an animation to .pz3 or .vue files. When you render the animation it will create the appropriate video file someplace else, it doesn't reside in the .vue or .pz3 file. I'm not sure if that's what you're asking about. Could you clarify more if I'm wrong.