Check out some options how sld files might be converted to iges format.
Old (.sld) files from AutoCAD represent set of slides made in old version of of AutoCAD using the the mslide command. These are pictures so it's not really possible to converted these to 3D formats. Perhaps old versions of AutoCAD could have been used to recover the sources, but it is likely your only option now is to either re-draw the CAD file, use the ancient sld2dxf to at least get DXF back (poor results), or look for download of some ancient version of AutoCAD and hope for the best.
Updated: March 17, 2023
Unfortunately, there is no detailed software record in the database for this conversion.
Additional links: Open sld file, Open iges file
SLD
Files with sld extension are quite often slide files from Autodesk AutoCAD, a CAD modeling software.
An sld file extension is related to the XnView a picture image editing program. An sld file contains slide show.
An sld file extension is related to the 3i SlideBook picture image file format.
Files with sld file extension are related to the Styled Layer Descriptor format.
Files with sld file extension might also be found as older export files from DOS version of NEPLAN software.
IGES
Files with igs extension can be typically found as 3D graphics data saved in International Graphics Exchange Standard (IGES) format used for data exchange.
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