I just did a fresh install of Poser 4 and looked at the Poser 2 hair. The only material in any of the Poser 2 hair is Preview. I then downloaded the update from CL and ran it on the new install. The hair stayed the same. Somewhere, there must be a download that has installed new Poser 2 hair OBJ files. It might have been one of the unofficial Poser 4 updates. I was thinking that it might be a Zygote/DAZ freebie that makes the P4 hair work on the Mill people, but I couldn't find any other hair that references the P2 hair OBJs.