We have found one software suitable in our database for this conversion.
Several Apple apps including the basic Preview from macOS / Mac OS X can access icons from ICNS package and export the individual icons as normal images. When you perform icns to exr conversion, just make sure you export the icon of the file size you want and save it as EXR file.
Updated: June 10, 2019
ICNS
Files with icns file extension can be usually encountered as icon archives from Mac OS X (macOS). Contains several sizes of icons in a single file.
EXR
An exr file extension is used for images stored in the OpenEXR Image Format that was developed by the Industrial Light & Magic. OpenEXR image format was going to public in 2003 and it is supported by popular graphics applications, such as Adobe Photoshop, Adobe After Effects, 3D Studio Max, Blender etc.
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