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 file, 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.
Additional links: Open igr file, Open dxf file
IGR
Files with the igr file extension can be mainly found as drawing design made using the SmartSketch software.
An igr file extension is related to the Quest3D and used for its channel group layout files.
DXF
Files with dxf extension can be typically found as 2D CAD drawings saved in the Drawing Exchange Format, a common format for exchange of engineering drawings.
Files with dxf extension were associated with Micrografx Picture Publisher. Now this project is discontinued.
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