iam to fbx conversion is typically searched by inexperienced users that are looking for a way to export Autodesk Inventor assemblies (.iam) to FBX format, considering that Inventor lacks this functionality by default.
The usual work around is actually to use 3ds Max, since it can be used to import .iam files directly and also supports export to FBX format. Alternative is to download and use Fusion360 as it should offer the same thing. Autodesk offers 30-day trial version, you will just need Autodesk account. Some users report that you can also use A360 (Autodesk Drive), upload your files there and download it in FBX format.
Updated: July 25, 2023