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STATUS_OBJECT_NOT_EXTERNALLY_BACKED
The file has no external backing association
This result is documented for external-backing control codes. Windows Overlay Filter can associate file content with an external provider, such as a WIM provider or the individual compressed-file provider. The status means the queried file has no such association.
It is normally a state mismatch rather than data corruption. Confirm that the operation targets the intended file and that the caller did not confuse an ordinary resident file with a WOF-backed file. Deleting external backing also returns this status when there is no association to remove.
What to inspect
- Query the exact file handle with the external-backing control code.
- Verify that the WOF service or intended provider is present for provider operations.
- Do not assume the visible file size proves that content is externally backed.
References
- Microsoft: FSCTL_GET_EXTERNAL_BACKING
- Microsoft: FSCTL_DELETE_EXTERNAL_BACKING
- Microsoft: FSCTL_SET_EXTERNAL_BACKING
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