HaloMods "Classic" Read-only Archive

I have a problem when I try exporting 3dmodels from Halo Map Tools 3.
Whatever model I try exporting just becomes a straight line with a lot of vertexes in it (in Lightwave Modeler) or nothing at all (gmax, Milkshape 3D). Anyone know what could be wrong?

Try Importin With Another Program.

What other program? That's 3 different applications with 3 different .obj importers I've tried, and none of them show anything normal.
Then something must be really wrong...
Maybe someone could tell me a working combination for those obj-files.
(These .obj-files exported from HMT3 are the only .obj-files I've ever had any trouble with btw)