By importing a docx file Confluence grumbles that it "is not a valid binary Word 97-2003 document", and it is right, it clearly a docx document. But actually Confluence supports docx files since version 3.1 (https://confluence.atlassian.com/confkb/error-appears-when-attempting-to-import-display-or-edit-microsoft-office-2007-documents-200213523.html) and the version of Confluence is 5.4.3.
The file upload doesn't work, here the link to a screenshot on an external picture hosting service:
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