OptionalcalculationDirections on how formulas should be recalculated in the workbook.
OptionalexternalsExternal cells referenced by the workbook. An external cell is a cell in another workbook.
OptionalformulasDeduplicated formulas used in the workbook. Stored in R1C1 notation. Two formulas are considered to be the same when their respective representations in R1C1 notation, are identical.
Name of the workbook. In the case of a .xlsx file it will be the filename.
OptionalnamesAn array of the workbook's defined names.
An ordered array of the worksheets in the workbook.
OptionalstylesStyles for cells in the workbook.
OptionaltablesMetadata on the workbook's tables.
OptionalviewsThe different display configurations saved for the workbook.
A workbook is a collection of worksheets, styles, defined names, and other metadata. It's what's commonly known as a spreadsheet.