Sorry, but I really don't understand... I dunno if there's a misunderstanding on either of our parts or I really have lost a plot or five....
Probably my fault. All I'm saying is Blitz doesn't allow you to create music, sounds or animated models internally so you can't write your own loaders. All you can do is what Terapak does, extract them to disk, load them normally and delete them again. Which is neat and tidy, but not very secure.