eDrawings (.edrw) are created for publishing and sharing purposes by SolidWorks users and typically they cannot be exported to any other CAD format. If you need to export your SolidWorks files, you need to use the source (.sldprt, .sldasm etc.) in order to save it in IGES format. This only export the geometry though, if you want to export whole 3D model you have to pick another format.
Convert SolidWorks eDrawing file to IGES 3D exchange format.
We found one software available in the database for this conversion.
Microsoft Windows software - convert edrw to iges on Windows
A 2D and 3D CAD construction software
Convert from edrw 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.