I don't think it's possible to extract them. They seem to be wrapped in a proprietary file format within the game engine.
A DOS utility managed to find some XMI files inside the data.001 file, but I could not find a way to extract it or even get information such as file name. All it told me was the individual sizes of the XMI files. It's possible that the rest are spread around in the other .001 files such as madness.001.