The reason for NVDA to announce Explorer in the title bar is because the desktop is integrated into File Explorer.
I've noticed this since Windows 7. And, continues be be the case in all newer versions of Windows.
This is clearly not an NVDA issue since Windows has been implementing the integration of the Desktop into File Explorer in all versions of Windows since Win 7.
I look forward to the new mailing list so that all messages can be routed by level of importance!
Carlos Gonzalez - Los Angeles, CA. - email@example.com