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Answer: Excel xlsx format
The Excel xlsx file format is not supported for files stored in Cloud Storage when creating external tables in BigQuery. Supported formats include Avro, CSV, newline-delimited JSON, Datastore export files, Firestore export files, ORC, and Parquet files. For more details, refer to [Google Cloud's documentation on external data sources](https://cloud.google.com/bigquery/external-data-sources).
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