Programs like AnyCAD Exchange3D or similar 3D model converters can help you to quickly convert one 3D model format to another. You can probably achieve the same with the original software, but sometimes the format support is pretty limited.
Convert Autodesk Kaydara 3D data exchange format to IGES 3D exchange format.
We found 3 software records in the database related to .fbx to .igs file format conversion.
Microsoft Windows software - convert fbx to igs on Windows
A widely-used 3D animation application from Autodesk
Convert from fbx file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned fbx to igs. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A 3D CAD translation softwate
A 3D model converter