alt Hacker News.docx and .xlsx are also just zip files with XML and attachments. The bad thing is that the XML is Word's internal document structure serialized and behavior for some values is only defined in Microsoft's code.
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godman_8 • today at 7:58 AM
Even pk3 files from the id Tech engine are just zip files.
I've worked on docx and xlsx import/export and the public documentation for the formats was sufficient for normal documents (maybe excluding some very exotic features). That was ca 2010.