Originally Posted by Vic47

and D is always 1 (so far)

Lilith movies can have a D value of 1 to 4, for the different animations during the movie. Quick check shows that Kasumi also has 4 files per stage.
Oversight or does the first file automatically move to the next one?

Well, yes, during the movie the animations tend to change back and forth. It starts with "idle" state, then changes to the slow movement, then - to fast movement, then stops to idle and repeats, and after another fast movement stage changes to "finish" scene, with alot of cum splattered around. If they are those - then yes, it changes automatically. Though, it's nice that you've noticed this - i never knew about that.