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ERROR_EXTENDED_ERROR
The generic code is a signal to obtain provider-specific detail
ERROR_EXTENDED_ERROR says that an extended error occurred but deliberately does not encode the complete reason in the Win32 value. The actionable information belongs to the API or provider that returned it. WNet APIs are a common example: when they return this code, WNetGetLastError can expose provider-specific error text and identifiers.
Diagnostic handling
- Preserve the original API result and query the documented extended-error interface immediately, before another call overwrites thread or provider error state.
- Record the provider/component name, extended numeric code, text, resource name, and operation.
- Do not map every occurrence to a network-drive problem unless the producer is actually a network provider.
Recovery boundary
Base remediation on the retrieved provider-specific reason. The outer value alone is intentionally insufficient to justify credential, connectivity, storage, or retry actions.
References
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