What does HRESULT 0x87AF001A (SQLITE_E_NOTADB) mean?

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The opened file is not a SQLite database in the expected format.

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SQLITE_E_RANGE	SQLITE_E_NOTICE

SQLITE_E_NOTADB

SQLITE_E_NOTADB corresponds to SQLite SQLITE_NOTADB. SQLite opened a file but found that it is not a database file it can interpret.

Verify the resolved path; a common cause is opening a configuration file, an HTML error page, an empty placeholder, or the wrong environment database.
Check whether the application expects an encryption extension or a different SQLite-compatible engine that is missing at runtime.
Preserve the original file before recovery attempts and do not overwrite it by creating a new database at the same path.

PRAGMA database_list;