Issue:
How to import Fusion 360 '.f3d' files into Inventor.Getting message "Failed to open document" when attempting to open a Fusion 360.f3d file.
Solution:
It is not possible to open .F3D files in Inventor.See article for work-around on opening a Fusion 360 model in Inventor.
How to export Fusion 360 assembly and import it in Inventor.