sorry for my English
i have download your 3ds and i open it with deep exploration but the in 3ds i don't find the camera.
The camera in 3d studio max should to be a target camera and not free camera.
For WME to recognize the right objects in the exported file, they need to be named in a certain way. Walk-plane names have to start with "walk_", for example "walk_floor", blocked object names start with "blk_", for example "blk_desk" and waypoint names start with "wpt_", for example "wpt_01"(from manual of wintermute, read it in section 3ds ).
then there aren't light for illuminate the scene.
for me is better cut the doors if the character need go into the house and the roof don't need for the moment.
then y can use only a standard material grey for all object (the file is more light).
I hope I have helped you