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ERROR_NOT_SUPPORTED
The requested operation is unsupported
ERROR_NOT_SUPPORTED means that the selected device, file system, provider, protocol, or Windows component does not implement the requested operation. The API itself may be valid while the specific target or configuration lacks the capability.
What to check
- Record the exact API, operation flags, and target object.
- Check whether support depends on the Windows version, file-system type, driver, transport, or optional feature.
- Query capabilities before using optional operations when the API provides a feature-discovery mechanism.
- Avoid translating this result into an authorization error; changing permissions normally does not add support.
How to handle it
Retry only after changing the operation, target, or configuration. A fallback should preserve correctness rather than silently dropping required behavior.
References
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