Problem open some dwg datas.

Hi,
I'm trying to use libre cad to export some dwg datas to dxf, but in the process lost the most important information. In the picture one is the dwg datas open in DWG trueview, in the second what i see in librecad.  I atacht the DWG datas to.
thanks

Librecad doesn't do well with opening dwg files.

I'm using the free "Teigha file converter" to convert from dwg to dxf.