Details: File format summary

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Summary
Name	XLSX Strict OOXML Spreadsheet
Version	2007 onwards
Other names
Identifiers	MIME: application/vnd.openxmlformats-officedocument.wordprocessingml.document Library of Congress Format Description Identifier: fdd000401 PUID: fmt/1828
Family
Classification	Spreadsheet
Disclosure
Description	XLSX Strict is the implementation of the Office Open XML spreadsheet format that strictly conforms to the ISO 29500-1: 2008-2016 standard.
Orientation
Byte order
Related file formats	Has priority over Microsoft Excel for Windows (2007 onwards)
Technical Environment
Released
Supported until
Format Risk
Developed by	Microsoft Corporation
Supported by	Microsoft Corporation
Source	Danish National Archives / Danish National Archives
Source date	14 Feb 2023
Source description	This format can be identified via a container signature in DROID version 6 or later. The PRONOM database cannot currently represent container signatures.
Last updated	14 Feb 2023
Note