Tables are written into the BIFF8 worksheet stream just before EOF as a FEATHEADR11 / FEAT11 / LIST12 record group, only when the file format is BIFF8 ( layout. Workbooks without tables save exactly as before. The reader populates the same collection on load (v2.33.1+), so a round-trip preserves the table range, name, display name, style, and banded-row flags
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