You might give this a go:
http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=9256041
It is the free FBX converter from Autodesk.
It will take an fbx and turn it into a 3ds or obj file that Carrara standard could load.
Not sure if it will bring in the animation - don't think Carrara can use keys from a 3ds file, at the least you should get the mesh and textures.

wayne k
guam usa