Autodesk Navisworks 2015 supports 2D and multi-sheet files that can be reviewed, or combined with models to provide multiple representations of project data.
The supported 2D and multi-sheet file formats are: DWF, DWF(x), and native file formats (NWD and NWF).
When you open a supported file, which contains multiple sheets/models, the default sheet/model is displayed in the Scene View, and all of the file's sheets/models are listed in the Project Browser window. If a file contains both 3D models and 2D sheets, the 3D model is loaded and displayed in the Scene View by default. If you do not require 2D capabilities, simply close the Project Browser window and continue working in a 3D workspace.