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

Forgot to ask how exactly to make the legs. Here's an example from the standing animation.
Link

I didn't specify... The legs needed to be different models, a model for the left leg and a model for the right leg, but if each leg is colored with a separate texture, then everything is fine.
P.S.: I also found an interesting converter from the Heroes format to the obj format; it might also convert it back.