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Right-click any DWG file in Vault Professional 2014 & select "View In Window" from pop-up menu forces AutoCAD Mechanical to open instead of the "DWG True View" viewer. DWG viewer IS installed on client machine.
Any ideas, anyone?
That's because your DWG launcher is set to AutoCAD Mechanical. It looks like you installed ACM after TrueView.
You can change this behaviour by modifying registry. See this DWG launcher fix by John Evans.