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After installing ArcGIS 10.6, I was disappointed to discover that ECW files were not supported. Refer GeoNet. This is a popular format in Australia and I had many raster images stored in ecw format.  Unfortunately, because the files were not recognised, I couldn’t even use ArcGIS to convert the images to another format. I decided to roll back to ArcGIS 10.5.1 and wait for ESRI to resolve the problem.

Good news! A patch is now available for 10.6 that allows this version to support the ECW raster format.  The reason it was not included in 10.6 was due to a compiler incompatibility.  I haven’t installed and tested the patch yet – I will need to revert to 10.6 first.

You can download the patch from ESRI here.