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After creating a raster format DLL, to view and use a raster format not currently supported by ArcGIS, the raster is not listed in ArcMap or ArcCatalog.
The Windows registry keys do not detect the new format DLL.
Warning: The instructions below include making changes to essential parts of your operating system. It is recommended that you backup your operating system and files, including the registry, before proceeding. Consult with a qualified computer systems professional, if necessary. Esri cannot guarantee results from incorrect modifications while following these instructions; therefore, use caution and proceed at your own risk.