How do you import? If you use your own importer, then you should make an option to reverse face winding (see S3D). Face winding dictates the wind order of vertices for a face: vertex 1, 2, 3 vs vertex 3, 2, 1 and is indeed related to LH or RH coordinate system. Wings isn't wrong, the exported OBJ technically isn't wrong either. The biggest problem is lack of standard with OBJ-format when using different applications (no way to specify winding and up-vector), and as such if you do not have options to deal with this upon importing, then normals can be flipped, and models can be on their sides as well as commonly seen when mixing different programs.
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