.IGR File

The igr file extension is used by SmartSketch, a business diagramming and drawing software for Microsoft Windows operating system developed by Intergraph Corporation.

A typically igr file stores drawing design created in the SmartSketch.

Files with the igr file extension can be mainly found as drawing design made using the SmartSketch software.

How to open:

Use SmartSketch to open and work with the .igr drawing design files.

How to convert:

SmartSketch probably can export its own designs (.igr) to other graphics formats or even PDF documents.