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The .docx format is just a zip file containing multiple .xml files (and sometimes other types) that constitute a given file.
The document content structure is standardized on Office Open XML (https://en.wikipedia.org/wiki/Office_Open_XML).
To explore a .docx file you can unzip it into a folder ie: unzip -d unzipped-folder my_docx.docx
unzip -d unzipped-folder my_docx.docx
Key files:
Super Editor imports/exports to/from .docx using SuperConverter For import, see docxImporter.js For export, see exporter.js
docxImporter.js
exporter.js