What is the best way to import Inventor files to Unity

I have tried every way possible that i can think of to get an Autodesk Inventor .iam or .ipt file to convert to something i can get into Unity. I have opened it in Maya, 3DS Max, tried to import it into Blender, every single one has it's own issues. I have tried the Autodesk FBX converter with no luck. Any suggestions would be helpful. I just need to get this file into an importable format in Unity and i can work from there.

thanks in advance.

Save the .ipt as an STL in inventor then you can import the STL file into blender

Save the inventor file as an .stl file.
Open it in blender and save it as a .dae (Collada) file.
You can then import it as an asset into Unity.