We use ODA Viewer and OdVisualizeViewer to open and visualize all file formats supported by ODA Products.
You need following archives: Kernel, Visualize and VisualizeQt, corresponding archives for the file formats (BimNv to visualize .nwc and .nwd files, BimRv for .rvt and .rfa and so on).
Unpack and extract them into the same folder; go to exe\vc15_amd64dll sub-folder and run OdVisualizeViewer, activate as described in the email (ODA Trial Subscription Approved).
These samples are based on QT libraries. Please, follow this instruction to setup the environment to be able to build and change these programs.