this post was submitted on 04 Mar 2026
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DOCX is supposedly an open standard too, the thing is neither Microsoft nor Adobe fully follow it and instead opt to make it slightly incompatible in order to make it hard for competitors to use it without issues.
EEE tactics.
docx is OOXML, Open Office XML.
However, it was definitely written to ensure existing doc files could be fully supported, so a lot of the format is "bit 7: if enabled, use Word for Mac 5.0 layout engine." So... Documented, yes. Usable, no.
PDF, as mentioned, is very similar. The format is available, but no one really wants to implement ALL of it.