Hi Pilou,

re:
> So I must Decimate and/or make some auto remeshing with some tools like
> this free one! ;)
> ... if i want really put this file in Moi for any reasons! ;)

Yes you would need to significantly rework this mesh to be able to bring it into MoI.

In general you would be better off using a polygon mesh editing program to work on that type of data, not MoI.

- Michael