Check out some options how igr files might be converted to dxf format.
Intergaph SmartSketch diagramming and technical drawing software supports several CAD formats, including the DWG, in which it can export its own IGR drawing designs. Once you have the DWG, you can convert it using any of the available DWG to DXF conversion solutions.
Unfortunately, there is no detailed software record in the database for this conversion.
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