A: Yes, but first ensure no program requires it. Use Autoruns (Microsoft Sysinternals) or Process Explorer to check for DLL loaders. Then uninstall the associated software properly—do not delete the DLL manually.
If a piece of software that relies on this control was uninstalled, it may have incorrectly removed the DLL file, taking it away from other programs that needed it. Conversely, a botched installation might have failed to register the file in the Windows Registry. mdivwctl.dll