SolidWorks CAD software supports great number of CAD formats, both from commercial platforms as well as exchange standards so you should have no trouble saving .sldprt files to .iges format using Solidworks.
As for the other programs there do exist dedicated conversion programs for CAD formats like the Cross-Manager that should help you with various CAD conversions including the sldprt to iges conversion. You can also check sldprt to igs conversion as the three-letter file extension is more common.
Updated: January 24, 2022
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