What does HRESULT 0x00040944 (IDS_MON_INVALID_CATALOG) mean?

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the query names a search catalog identifier that the provider does not accept.

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IDS_MON_VIEW_ALREADY_DEFINED	IDS_MON_INVALIDSELECT_COALESCE

IDS_MON_INVALID_CATALOG

IDS_MON_INVALID_CATALOG is a catalog-selection failure. For current Windows Search SQL, Microsoft documents only one catalog name, SystemIndex; remote queries still qualify that catalog with a computer name rather than selecting an arbitrary database-style catalog.

Validate the FROM target generated by the application

Log the exact catalog token and any machine prefix.
For Windows Search, emit FROM SystemIndex locally or the documented [ComputerName.]SystemIndex form for remote queries.
Do not substitute a filesystem path, index display name, SQL database, or user-visible search label as the catalog identifier.

Legacy parser messages use catalog terminology more broadly, but current Windows Search narrows the query target. This makes provider migration errors common: a configurable “catalog” field from old code may contain a value that has no meaning to Windows Search. Correct the provider-specific target selection before investigating crawl scopes or indexed locations.

FROM clause · Parser messages · Querying SystemIndex

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