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ERROR_FILE_SYSTEM_VIRTUALIZATION_UNAVAILABLE
The projected namespace provider is not available to service the request
Projected File System exposes files and directories from a backing store through a user-mode provider. Directory enumeration, placeholder creation, and file-data recall can require provider callbacks. This status means the virtualization mechanism exists, but the provider or its active virtualization instance cannot currently answer the operation.
Check whether the provider process is running, the ProjFS optional component is enabled, and PrjStartVirtualizing completed for the correct virtualization root. A temporary shutdown, crash, upgrade, or disconnect from the backing store can make projected entries unavailable even though cached local files remain readable. Distinguish provider availability from network reachability and from ordinary access-control failures.
What to inspect
- Confirm the provider process and virtualization instance are active.
- Check provider logs for callback or backing-store failures.
- Retry only after the provider lifecycle has returned to runtime state.
References
- Microsoft: ProjFS programming guide
- Microsoft: virtualization instance lifecycle
- Microsoft: ProjFS directory enumeration
- Microsoft: ProjFS view and cache changes
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