Running BrickPi Project LXF files through Lego Digital Designer

Hi, I’m having trouble with the Lego Digital Designer not showing the LXF files for any of the BrickPi projects. For example, if I try to open the Simplebot LXF file, the Lego Digital Designer simply shows an empty canvas.
I would like to know if there is a supporting program that will enable the Lego Digital Designer to display files that contain a Raspberry BrickPi (where I think the problem is at, the Designer cannot render files that contain a Pi).
This is for my honours project and I would like to be able to design my own robot in the Digital Designer.

Thanks so much