David -
It is still available it has just been moved to the Developer tab which is not show by default.
Go to File, then Options and on the right column you will see that the Developer tab is unchecked, check that box and then click OK
You will see the Developer tab appear and once you click that tab on the right you will see the option to view or hide options and one of those options is the Drawing Explorer Window.
Hope that helps.
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