Convert SLD to IGES

sld to iges conversion is most likely related to export between two CAD formats. Drawings in SLD format (AutoCAD slides) can be exported to IGES format with the File ► Export or Save as.. function found in Autodesk AutoCAD. Unfortunately, we do not have any information about specifics for this conversion, so perhaps if you are looking for something particular, contact Autodesk AutoCAD community forums.