Hi Pilou, I would not advise to try and convert that file as a sub-d mesh. It's 108 different mesh objects, with approx 70,000 polygons all triangles no quads at all.

It is not structured to be used as a sub-d control cage and so it is not one that I'd expect to work well with the sub-d converter.

If you did want to try it you would need to make sure you have a very large amount of system RAM.

- Michael