There are two way to attach texture in Belender. I find a way to support other than UV image editor. I know this is a wrong way, it only search one texture image file. If I have enough time, I'll try to implement multiple matrial or texture.
http://www.ie.u-ryukyu.ac.jp/~kono/tmp/export.py
kono@ie.u-ryukyu.ac.jp
check texture file in material link