UAC elevation does not allow drag and drop [duplicate]

Lower-privileged processes cannot drag-and-drop to higher-privileged ones on Vista and later.

The bottom line is that drag and drop from Windows Explorer will not
work if your application is elevated.

https://web.archive.org/web/20190118125513/https://blogs.msdn.microsoft.com/patricka/2010/01/28/q-why-doesnt-drag-and-drop-work-when-my-application-is-running-elevated-a-mandatory-integrity-control-and-uipi/

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