Look for the conflicting definitions to see where they are coming from.
ReadDirectoryChangesW reports that a deletion occurred, how can I learn more about the deleted thing?
It's already gone. If you need more information, you should have been remembering it.
Perhaps it's because you dispatched it.
QueryPerformanceCounter never fails
Of course, anything can happen if you break the rules.
Just some useless trivia.
IDCANCEL?
You get notifications that might not make sense.