The XLSB or Excel Binary Workbook is primarily associated with Microsoft Excel by the Microsoft Corporation. It is the new standard for Microsoft Office documents. The binary workbook differs from other Excel formats by saving the core components of the workbook in binary format which can dramatically decrease the file size. The downside is that you need Excel to read and edit it.

MIME TYPE: application/vnd.ms-excel.sheet.binary.macroEnabled.12

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