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ERROR_NOTIFICATION_GUID_ALREADY_DEFINED
The file already has a notification identifier
ERROR_NOTIFICATION_GUID_ALREADY_DEFINED is a Win32 result associated with filesystem notification metadata.
What the result means
A notification GUID is already associated with the specified file.
What to check
- Query the existing identifier before attempting to assign another.
- Determine whether the operation is being repeated idempotently or by competing components.
- Use the existing GUID when it belongs to the same logical registration.
- Coordinate ownership when multiple services manage the same file.
Recommended handling
Do not overwrite an existing identifier blindly. Conflicting notification identities can cause duplicate, missed, or misrouted events.
References
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