Office Open XML is the name of the file format since Microsoft Office 2007. Until Office 2003, the document format of Office was a unique binary format. From Office 2007 onwards, the file format was newly stipulated in compliance with XML. By specifying the XML format, it has become easier to create Office documents with third-party applications, read them, and use them.
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In addition to its own binary format, Microsoft Word had a text exchange format called RTF, which extended the text. Using RTF, Word documents could be read and written in many applications. The XML format, WordProcessing ML, was first introduced in Word 2003.
In Office 2007, the document formats for Word, Excel, and PowerPoint were defined in an XML format called Office Open XML. Documents created in Office consist of multiple XML and image files, which are compressed into one using ZIP compression. This compressed package is called a package.
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Example of decompressing ZIP of Word docx
When Microsoft Office documents were in binary format, to read Office documents with other applications, one had to obtain the specifications from Microsoft and analyze the Office documents.
Since being standardized, it has become relatively easy to read the contents of Office documents and reuse them. Additionally, it has become easy to output files compatible with Office documents in other applications.
The OOXML format is an international standard, and applications other than Microsoft Office can also utilize OOXML documents. The main applications are:
Screen for editing Word docx
See "Office Open XML and the ECMA-376 Specification" ( [4] ) for more.
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