It consists of storages, streams, and substreams. Ī CFB provides a file-system-like structure within a file for the storage of arbitrary, application-specific streams of data. The structure of an XLS file since 1993 (BIFF5/Excel 5.0) is an OLE (object linking and embedding) compound file as specified in. Since 2008, the structure for the XLS format used since Excel 97 has been kept up-to-date at. The specification released in 2007 is available as Microsoft Office Excel 97-2007 Binary File Format Specification. See Notes below for more detail on versions of BIFF.Īlthough the XLS format is proprietary, since 2007 it has been covered by Microsoft's Open Specification Promise. As of late 2019, the documentation for File formats that are supported in Excel, from Microsoft, lists two variants of XLS format, distinguishing between 'Excel 5.0/95 Binary file format' and 'Excel 97-Excel 2003 Binary file format.' These correspond to BIFF5 and BIFF8, respectively. Although it cannot support the latest functionality of the Excel application, BIFF8 has continued to be available as an alternative to the XLSX/OOXML format, standardized as ISO/IEC 29500, for saving spreadsheet files in Excel. This format description is primarily for version 8 of BIFF (BIFF8), introduced with Excel 97 in 1997. The format is also referred to as Binary Interchange File Format (BIFF) in Microsoft's technical documentation. xls extension and referred to as XLS or MS-XLS, was the default format used for spreadsheets in Excel through Microsoft Office 2003. The Microsoft Excel Binary File format, with the. This Office version is best for low-performance PCs and it supports them.Microsoft Office Excel 97-2003 Binary File Format (.xls).

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