From the NavisWorks KB:
Problem:How to bring through properties as well as geometry from ADT and ABS 2007 files into Jetstream
Please ensure Jetstream v5.1 or above is installed.
Please ensure that the ADT and ABS 2007 Object enablers are installed: -
**Please note, the ADT object enabler needs to be installed before the ABS object enabler.
PS. NavisWorks have some days ago launched their updated public website. http://www.navisworks.com