The trees are more placeholder i think and are multi-textured.
They are written into the .fpe
;visualinfo
textured =
baseColorMap0 = bark10_color.dds
normalMap0 = bark10_normal.dds
surfaceMap0 = bark10_surface.dds
roughnessStrength0= 1.00
metalnessStrength0= 1.00
baseColorMap1 = birch leaf_color.dds
normalMap1 = birch leaf_normal.dds
surfaceMap1 = birch leaf_surface.dds
roughnessStrength1= 1.00
metalnessStrength1= 1.00
etc ,etc
The Problem is when you tick " Enable Custom Materials " it goes to pot as this is not yet catered for and they lose the texture path.
It normally only goes back after restarting Max.
The only person ever to get all his work done by "Friday" was Robinson Crusoe..