We have found one software suitable in our database for this conversion.
Intergaph SmartSketch diagramming and technical drawing software supports several CAD formats, including the DWG, to which it can export its own IGR drawing designs, which is what igr to dwg conversion typically represents.
It doesn't look like that any other program supports the IGR format, so it is probably your only choice if you need to convert igr to dwg.
Updated: July 3, 2020
IGR
Files with the igr file extension can be mainly found as drawing design made using the SmartSketch software.
DWG
A dwg file extension is used for common CAD file format, originally used by AutoCAD. A DWG is a proprietary format and can only be created in AutoCAD. Other CAD programs can usually import it, but not create its proprietary form. It's because of this, that DWGs are often exported to DXF interchange format, so they can be seamlessly used in other CAD programs.
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