[Polak2]

Further investigation how 3D editor "sees" extracted 3D multisub objects yielded more complicated picture:

Summary Info for  (at Frame 0)

Objects:
  			Cast	Receive	Motion		
  Name	Type	Verts	Faces	Shadows	Shadows	Blur	Hidden	Frozen	Material (Type)
  ------------------------	------------	------------	------------	------------	------------	------------	------------	------------	------------------------
  default	Editable	4620	2861	Yes	Yes	No	No	No	Default (Multi/Sub-Object)
  default_mat1	Editable	0	0	Yes	Yes	No	No	No	concrete2 (Standard)
  default_mat2	Editable	166	136	Yes	Yes	No	No	No	Pavaj (Standard)
  default_mat3	Editable	1200	656	Yes	Yes	No	No	No	Brick_wall_black (Standard)
  default_mat4	Editable	1178	610	Yes	Yes	No	No	No	Bricks_roof_D (Standard)
  default_mat5	Editable	622	472	Yes	Yes	No	No	No	Steel (Standard)
  default_mat6	Editable	116	58	Yes	Yes	No	No	No	arm_cement (Standard)
  default_mat7	Editable	6	4	Yes	Yes	No	No	No	brick_wall1 (Standard)
  default_mat8	Editable	36	24	Yes	Yes	No	No	No	WWIIPosters (Standard)
  default_mat9	Editable	124	64	Yes	Yes	No	No	No	hkomandantur (Standard)
  default_mat10	Editable	76	38	Yes	Yes	No	No	No	lager (Standard)
  default_mat11	Editable	206	154	Yes	Yes	No	No	No	Window01 (Standard)
  default_mat12	Editable	40	20	Yes	Yes	No	No	No	Window02 (Standard)
  default_mat13	Editable	12	6	Yes	Yes	No	No	No	cellar2 (Standard)
  default_mat14	Editable	4620	2861	Yes	Yes	No	No	No	Gate_D (Standard)


Scene Totals:
  Objects: 15
  Shapes: 0
  Cameras: 0
  Lights: 0
  Helpers: 0
  Space Warps: 0
  Total: 15

Mesh Totals:

  Verts: 13022
  Faces: 7964
Materials:

  Default  ( Multi/Sub-Object )
      concrete2  ( Standard )
      Pavaj  ( Standard )
      Brick_wall_black  ( Standard )
      Bricks_roof_D  ( Standard )
      Steel  ( Standard )
      arm_cement  ( Standard )
      brick_wall1  ( Standard )
      WWIIPosters  ( Standard )
      hkomandantur  ( Standard )
      lager  ( Standard )
      Window01  ( Standard )
      Window02  ( Standard )
      cellar2  ( Standard )
      Gate_D  ( Standard )

  concrete2  ( Standard )

  Pavaj  ( Standard )

  Brick_wall_black  ( Standard )

  Bricks_roof_D  ( Standard )

  Steel  ( Standard )

  arm_cement  ( Standard )

  brick_wall1  ( Standard )

  WWIIPosters  ( Standard )

  hkomandantur  ( Standard )

  lager  ( Standard )

  Window01  ( Standard )

  Window02  ( Standard )

  cellar2  ( Standard )

  Gate_D  ( Standard )

Notice that for example Mat#1 which is concrete2 has no vertices and faces which is INCORRECT, same with last one Gate_D which shows to be on ALL elements of this model. This is also wrong.
Those materials in between are also incorrectly assigned, but they may not appear so evidently incorrect as the ones I used as an example.

What I am trying to say is this: all known 3D editors which we use to edit extracted models may get wrong/scrambled picture from extractor. Of course that only applies again to Multimaterial objects - the single materials are OK. I'll keep up some more digging.