Hi,
Before we/greenworks changed to primarily supporting .tgo for the Xfrog plants, we mainly worked with Xfrog .obj files. As far as I can recall, there were no particular problems opening the Xfrog .obj models (for the version 2.0 Xfrog models anyway) and any problems there were with .obj opening were to do with .obj files which came from other sources.
Regards,
Jo