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STATUS_EXTERNAL_BACKING_PROVIDER_UNKNOWN
The external backing provider identifier is not recognized
Externally backed files store provider-specific information after a WOF external-information header. This status indicates that the provider recorded in that metadata is unknown to the component processing the file.
Possible causes include unsupported provider versions, incomplete deployment of the backing service, or metadata copied to a system that lacks the original provider. Do not replace the provider identifier or materialize the file until the backing source and provider data have been preserved.
What to inspect
- Record the provider identifier and provider-specific metadata.
- Check whether the backing service and matching Windows feature are installed and running.
- Test whether the file can be materialized safely from the original backing source.
References
- Microsoft: FSCTL_GET_EXTERNAL_BACKING
- Microsoft: FSCTL_SET_EXTERNAL_BACKING
- Microsoft: FSCTL_DELETE_EXTERNAL_BACKING
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