Both .nmf and .lws files originate from LightWave 3D software, so if any kind of nmf to lws conversion is possible, it would be done with this software. Might be related to export/import of map files to scenes, but we have found no specifics about it. When in doubt, you can always reach out to the online LightWave 3D community or support.
Updated: August 2, 2023