3dmf get in blend?

Hi, does anybody know how to get 3dmf format to blender?
I didnt find any script so I tried find some Convertor from 3dmf to an importable format for blender. Do you know about some free for Mac OS X?

I spend a lot of time by looking on net without succes.
I found “RB3D Utility a6” thats convertor from .3ds and .obj to .3dmf, but there is option to export to .3ds too. It works very nice with Samples but dont with files for ex. www.greatbuildings.com
It opens file with errors “Quesa Error: Invalid object for group”. Model looks OK but exported files are only 452 kB. Also Im able to open file again in this utility but never in Blender.

Thanks for help