This is just a simple front-end for Microsoft's Conv3ds utility. I became frustrated trying to figure out all the command-line switches (and I still don't understand all of them).
This is by no means a fail-safe application. It was something I threw together real quick since I just got 3D Studio. So far, it's been converting all the models, although I haven't tried any with animations included yet.
There're a couple of switches I didn't include simply because I didn't understand them. Any improvements or suggestions will be greatly appreciated. Just make sure you have the utility somewhere in your system's PATH so that the program will find it correctly.