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FDAEMON_E_FATALERROR
A critical document-filtering error aborted the operation
FDAEMON_E_FATALERROR is HRESULT 0x80041682. Windows documents it as “A critical error occurred during document filtering. Consult system administrator.”
Contract and failing stage
This result belongs to legacy Windows content indexing and is returned while running the filter daemon around a handler or internal indexing stage that cannot continue safely. The exact condition is: a severe handler crash, corrupted state, invariant violation or service-side failure terminates filtering beyond one recoverable extraction error.
This value belongs to the legacy filter daemon and content-indexing pipeline. It identifies failure while extracting or committing indexed content, so query syntax changes do not repair it. Preserve the document, filter handler and catalog generation that owned the work item. Current IFilter documentation clarifies handler extraction contracts, while the daemon HRESULT remains tied to the legacy content-indexing pipeline and its catalog generation.
Conditions that produce it
An unindexed document is only the outcome; it does not identify the handler, resource, partition generation, change list or word-list stage that failed.
Evidence to preserve
- Record faulting module before releasing the relevant objects.
- Associate document URL/path with the exact UTC timestamp and correlation identifier.
- Compare failing and known-good values for filter CLSID and bitness under the same provider or handler version.
- Record the source and normalization path of last daemon event before termination, not only its display form.
Hash document content while retaining file type, size, handler CLSID, extraction stage, block counts and catalog generation.
Diagnostic sequence
- Capture crash or WER record and faulting module at the call boundary that returns this result.
- Confirm the operation reached running the filter daemon around a handler or internal indexing stage that cannot continue safely with the intended document URL/path.
- preserve crash reports, service events, document identity, filter registration and the last successful extraction boundary.
Run a copied document through the same filter version in an isolated queue and compare the exact extraction or commit stage with a known-good document type.
Recovery and retry
Quarantine the triggering document or handler, repair the verified component and restart only after evidence is captured. Retry only after resource pressure, handler behavior, work generation or catalog storage state changes and stale work is discarded.
What the code does not prove
It does not prove that all documents or all filters are affected; preserve the triggering work item, handler and catalog generation before broad recovery.
Related HRESULT values
FILTER_E_ACCESS and format-specific failures can be document-level; this value identifies a fatal daemon path.
Developer and administrator guidance
Retain the document identity, filter CLSID/version/bitness, daemon event, catalog generation and retry or quarantine history. Before rebuilding catalogs or reregistering every filter, isolate the document, handler and failed work generation.
Practical scenario
One malformed container repeatedly crashes an old filter DLL. Reproducing against a copy and disabling only that handler prevents a fleet-wide restart loop.
Official Microsoft references
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