Autodesk Inventor should be able to import .stl files (3D printing stereolithography format) just fine and can be used for editing and making any of the Inventor's default file types, including assemblies saved as .iam files. Maybe it requires plugin in some earlier versions of Intentor though.
Convert Stereolithography CAD file to Autodesk Inventor assembly file.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert stl to iam on Windows
Autodesk Inventor is modeling application used to create 3D digital prototypes.
Convert from stl file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.