AutoPLANT and Prosteel Objects appears as a Rectangles

Hello.

I tried to load an i-model which was created on I-Model Composer and contains Prosteel and AutoPLANT Modeler Objects (AutoCAD 2012 Platform) and the Bentley Navigator (08.11.09.536) has not recognize the Objects.

I looked for an Object enabler but I didn't find a comatible version.

The strange thing is that some of the i-model files can be read and some of them not.

Regards,

Amit Cohen