It is no-go in RDS with UVM export. The RDS file will not reopen - I am missing some primative extension - whatever that means. In Carrara I have a problem, too If I open as vertex primative - I can get it into VM - but it still will not save. If I open a facet mesh, I will save as a *.car, but I cannot get it into VM. I get the damn preview window, which I do not want or need, but the 1:4 window view will not show. I have tried every option I can find and I cannot get the modeller to open with a facet mesh. That is why I stayed with RDS .