Autodesk FBX Converter

Gaieus

Transfer files from one file format to another more quickly and easily with the Autodesk FBX Converter asset exchange technology. This utility enables you to convert OBJ, DXF, DAE, and 3DS files to or from multiple versions of the FBX format. New tools are now available with the FBX Converter 2012.1. You can view FBX animation files in real time with the FBX Viewer, explore and compare FBX file contents with the FBX Explorer, and manage animation takes with the FBX Take Manager.

If you do not have the application they offer the plugins, scroll down to the standalone installer for Windows 32 and 64 bit and Mac.

I have not tried it myself yet but it's worth a shot it seems.

(Thanks for the find go to Colin Holgate over the SU Help Forums)