How do I add a CAD NWC file into TruViewer?
To be able to export the NWC, you will need a compatible application. Lucky for you, there is a plug-in created to work with AutoDesk applications. It's OK, if you don't have an AutoDesk application, because the utility is compatible with AutoCAD and Revit software-based products, as well as 3ds Max, Bentley MicroStation, and Graphisoft ArchiCAD software.
Download page: http://www.autodesk.com/products/navisworks/autodesk-navisworks-nwc-export-utility