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Attempting to install ArcGIS Military Analyst 9.0 on top of an ArcGIS Desktop 9.1 install produces the following error:
"Error 1904: failed to register C:\Program Files\ArcGIS\Bin\MAgeometry.dll"
While Military Analyst 9.0 can be installed on top of ArcGIS 9.1, the Geodesy functionality requires a file that is not included in ArcGIS 9.1.
Download the new 9.1 version of Military Analyst from the link in the Related Information section.