[Xylakant]

.docx files are archives of xml-files. No one wants to write that by hand.

Or, in more words: The format of the files is just the representation on disk - it’s not directly connected to how the files are generated or edited. XML files can be written by hand with suitable editor support.

[onion2k]

I think we have different ideas of what "written by hand" means. Someone making a Word doc is not writing XML by hand.