Quote - You made your own OBJ export program? A converter or something you use after exporting from Wings?

Yep!

Regarding vertex groups, you can make a simple experiment. Create a cube in LW and define some vertex groups. Make it so that they don't just coincide with your polygon groups. Then export as an obj file and import that into a new document. See if your vertex groups are still there. If they are, I'd like to see that obj file.

-- I'm not mad at you, just Westphalian.