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I've got a WKT specified coordinate system, how do I add this to ArcGIS?

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up vote 10 down vote accepted

In the file system, browse to the "Coordinate Systems" folder. This will be somewhere like C:\Program Files\ArcGIS\Desktop10.0\Coordinate Systems depending on your version.

Place your file in the appropriate directory and it will be available in ArcCatalog and ArcMap in the same place.

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