Navisworks File formats

Do we already know this (I haven’t always been sure)?
So here’s a link for the most up-to-date:
http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=10578958

- Mark D. Roach, Ideate Inc

File Formats
Autodesk® Navisworks® has its own native file formats (.nwd, .nwf, .nwc) but can also read a combination of many popular 3D CAD formats.