Before you can delete a reference file, it must be added to the workspace. To add a reference file to the workspace, select it on the Reference tab of the filter being used to define the workspace.
From the Workspace Explorer Reference Tab
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Right-click the item to delete on the Workspace Explorer Reference tab.
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Select Delete.
Using the Coordinate System
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Select the coordinate system for the reference file that shows up in graphics.
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Delete that coordinate system.
Using the coordinate system removal process removes the reference file from the database.