Hello!
I'll point you towards this thread:
https://www.frictionalgames.com/forum/thread-23378.html
This details how to use the Machine For Pigs assets in an Amnesia: The Dark Descent environment, including what Badcatz stated above, deleting the .msh and .anm files. Anything you copy over are "compatiable" with the current editors, that is to say, may actually turn on their sides when placed or not even load at all in the actual game.
The models/NPCs need to be resaved using the new model editor to be used, which is included in the 131111 .zip file in the first post of the above thread, which also details instructions on how to the set up the environment.
It is now a locked thread, so if you need further help, just ask here!