Open file in AutoCAD LT created in AutoCAD 3D MEP

Hi,

I have been sent an AutoCAD file (created using AutoCAD 3D with MEP). When I open the file in AutoCAD LT (for MAC) some of the detail is not displayed...it is shown as an empty box with the following text in the bottom left hand corner:

AecbDbDuct(AecbHvacBase70)

Do I need to upgrade my version of AutoCAD or is there some other way to see the detailed object?

Thanx,

Andy