Autodesk Inventor Users

First result in a google search.

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/Inventor-Can-Navisworks-files-be-imported-into-Inventor.html

Hello if you open the file in Navisworks manage you can export to FBX file then you can open the file in AutoCAD mechanical then you can export to a step file and then open it in inventor

Hope this helps