Well Looking at your "head with joined meshes.3ds" I can tell you that the meshes aren't truly joined. In blender I would select each of those objects and hit ctrl+j, then click yes when prompted to join selected meshes. However you could also select the three meshes and export them at the same time. If you are using blender you can export a 3ds file, but it will have no uvs. I export as obj then import that into wings3d and export a 3ds. That 3ds will have the proper uvs. You can also use biturn to convert the obj to 3ds, but this can cause some uv map corruption.