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STATUS_NO_EFS
No usable Encrypting File System implementation is loaded
EFS depends on NTFS support, system services, cryptographic providers, and policy. This status indicates that the required encryption implementation is absent or unavailable, rather than that one user lacks a private key for a particular encrypted file.
Check edition, volume type, policy, and service state before attempting certificate recovery. Copying an encrypted file to a file system that cannot preserve its metadata can make later recovery more difficult.
What to inspect
- Verify the target volume supports NTFS EFS and that encryption is not disabled by policy.
- Check EFS service and cryptographic-provider events and system component health.
- Keep encrypted originals on a metadata-preserving volume while repairing the EFS environment.
References
- Microsoft Open Specifications: Encrypting File System overview
- Microsoft Open Specifications: EFSRPC
- Microsoft: cipher
- Microsoft Open Specifications: NTSTATUS values
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