If you just need to convert a 3d object a program I use is
Biturn. You may not get the textures, and if your not the one that made the object it
may be a
little buggy movement-wise, but almost any object works and you could probably fix the glitches on your own and just recolour it. I know one big 'ol run-on sentence but...
Edit: I forgot but you need to turn them into .ASE format, Alice reads those too.