Blender not preserve smoothing groups when importing Wavefront .obj file. Why?

Hello,

I have a trivial scene. One triangle. The triangle was imported from a Wavefront .obj file. This file contains a single smoothing group.

Here is the file:

triangle

xyz

v 0.0 0.0 0.0
v 1.0 0.0 0.0
v 0.0 1.0 0.0

st

vt 0.0 0.0 0.0
vt 1.0 0.0 0.0
vt 0.0 1.0 0.0

n

vn 0.0 0.0 1.0
vn 0.0 0.0 1.0
vn 0.0 0.0 1.0

smoothing group

s 1

face xyz/st/n

f 1/1/1 2/2/2 3/3/3

I want to export the scene as a .3ds file. When I do the resultant file does not have a smoothing group. Sigh.

How to I tell Blender to preserve the smoothing group and send it to the exported file?

Thanks,
Doug

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