RTF is a global modification that replaces all towns in the game.

Unfortunately, I can't export models into the game; the editor always gives an error, so it doesn't matter what format they are if I can't get them into the game.

Oh, well, I can export them. I don't know how to create and process them, but I can export them. And I can give them to you as an archive with the models.
I thought you were exporting them... How do you manage without that? Do you just work with the animations? Or am I misunderstanding something?