blender2.69 fbx to UDK

Not sure if this post should be here…anyway I really like the feature of 2.69 about directly exporting sharp edge in fbx without edge split modifier. But it seems only work on mesh alone, everytime when I export mesh with armature to UDK by fbx format I can’t see any sharp edge smoothing in UDK. If I just export the mesh itself I got no problem. Any one get some advice? Thanks very much!

*** Moderation ***
moved from Game Engine Support and Discussion
it belongs to Blender rather than the BGE