Microsoft Excel Non-XML Binary Workbook 2007 onwards

Readable

spreadsheet

From Microsoft Office 2007 onwards, the core output format of MS Excel has been based on the Office Open XML (OOXML) file format. The ISO standard for OOXML is ISO/IEC DIS 29500. An OOXML file format consists of a compressed zip archive that is designated according to which file type it is. Further detail on OOXML can be found within fmt/189 - Microsoft Office Open XML.

Identify it

Extensions	`.xlsb`
MIME types	`application/vnd.ms-excel.sheet.binary.macroenabled.12`
PRONOM	`fmt/595`
Wikidata	`Q66759528`
Library of Congress	`fdd000512`

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Open it

LibreOfficeOpen sourcereads · MPL-2.0
Microsoft Office Excel 2007writes
MediaRich Serverreads

Convert it

To	With	Fidelity	Command and losses
Microsoft Excel for Windows 2007 onwards	LibreOffice	Partial	`soffice --headless --convert-to xlsx in.xlsb` Layout may shift; macros and some features are not kept.
OpenDocument Spreadsheet file format family	LibreOffice	Partial	`soffice --headless --convert-to ods in.xlsb` Layout may shift; macros and some features are not kept.
PDF	LibreOffice	Partial	`soffice --headless --convert-to pdf in.xlsb` Fixed layout: the document is no longer editable.
Comma Separated Values	LibreOffice	Lossy	`soffice --headless --convert-to csv in.xlsb` First sheet only, values only: formulas, formatting and other sheets are lost.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.

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