Your best shot for work and conversion of MultiGen formats (.flt) is to use the open source Blender software. With this program you should be able not only to edit, but also export .flt files to or from several other 3D formats or 2D CAD format, including common DXF format. But of course, there may be more programs capable of flt to dxf conversion.
Updated: June 4, 2020
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