It seems that igs to asat conversion, i.e. export of 3D models from IGES format (.igs, .iges) to Assamble SAT 3D format (.asat), is possible with some CAD / 3D modeling tools or dedicated CAD converters. Some of the software that can help you out to convert igs to asat are listed here.
Open IGS file Open ASAT fileA dedicated CAD converter