From a Rhino USB stick tutorial

 From:  Phil (PHILBO)
3726.20 In reply to 3726.19 
It is recommended that you use the Maya plug-in instead of manually exporting. This will also give you access to Animation functions as well. You can then post specific questions on the plug-in in the Maya section of the Plug-In Discussion / Support section of the Customer Forums at www.refractivesoftware.com/forum/.