While disassembling shutdown.exe for reasons, I noticed special handling of the /i (interactive switch). That was expected based on the documentation's note that it must be the first switch, but after those checks there was also special handling of an /unexpected switch. Supplying it, at least on my machine, always results in this message:
Failed to open UI.
I can't find any documentation of an "unexpected" switch and it's not clear to me what it would do.
Perhaps it is related to the Shutdown Event Tracker that pops up after login after an unexpected shutdown.
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