Qt WebEngine app cannot run if hosted on a network drive

Customer reported that Qt 5.15 has this issue, but Qt 5.9 is fine.

This issue does not occur with Qt apps that don't use Qt WebEngine.

Steps to reproduce

1. Build the WebEngine Widgets Video Player Example (https://doc.qt.io/qt-5/qtwebengine-webenginewidgets-videoplayer-example.html )
2. Use windeployqt to deploy videoplayer.exe to C:\Users\Public\VideoPlayer\
3. Use Windows Explorer to navigate to C:\Users\Public\VideoPlayer\ and double-click videoplayer.exe
4. Use Windows Explorer to navigate to \\[HOSTNAME]\Users\Public\VideoPlayer\ and double-click videoplayer.exe

Results

• Step #3 works and the video plays. This shows that the app has been deployed correctly.
• Step #4 fails with an error dialog, "The code execution cannot proceed because Qt5Core.dll was not found." (see attached screenshot) This shows that there is a problem with loading the binaries from a network path.