Except for some 3D modeling tools, you can also some dedicated converter like TransMagic in order to convert models from IGES 3D format (.igs, .iges) to 3D ACIS format (.sab). Used to translate models from exchange format to a specific vendor format.
Convert IGES 3D exchange format to 3D ACIS binary file.
We found one software available in the database for this conversion.
Microsoft Windows software - convert igs to sab on Windows
A dedicated CAD converter
Convert from igs 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.