Included in that release were the .ASE files used to generate all of the art assets used in the game.
According to Microsoft's EULA, so long as these art assets are not being used to make a profit, they can be redistributed, and basically I don't think that we can get in trouble using them for non-profit mods, etc.
I've figured out how to convert all of them to whatever file format people might want, and they're already skinned, although anybody wanting to use these for serious purposes will want to re-skin them, they're all skinned at 128/128, and they used a RGB team-color system that made things not look terribly good. Is there any serious interest in me releasing any of this stuff?
Here's an example of a conversion of a couple of files:

I should note that that Catapult there is already broken up into pieces- the MC II animations were done pretty much like Spring. So conversion would be a snap.