I took a look at the sample files you shared at Post #4
Images like this will not be imported to Wings3D anyway without a error be reported:
It's composed of segment of lines with non contiguous regions.
Wings3D would require the file to contain closed shapes (polygons) in order to get something to work with.
I did a test with a 3D object converter app I have and it displayed a couple of information about polygons resulting in bad objects (precisely 592) because it tries to build closed shapes from all those segments it found. The result is this:
Images like this will not be imported to Wings3D anyway without a error be reported:
It's composed of segment of lines with non contiguous regions.
Wings3D would require the file to contain closed shapes (polygons) in order to get something to work with.
I did a test with a 3D object converter app I have and it displayed a couple of information about polygons resulting in bad objects (precisely 592) because it tries to build closed shapes from all those segments it found. The result is this: