what is the best way to resolve? edit the tree in another separate kn5? directly from RTB...
What blender do u use, because i don't open nothing from fbx file, there is a plugin??
Any Blender? File>>import>>import FBX. just works (for me)
if you do not see that menu you may have accidentally turned off the importer for FBX, edit>>preferences, search FBX, tick the box