Misidentification of docx files

[katyo]

It seems .docx is missing in mime database.
I don't sure this is problem of treemagic itself.

doc.doc:
    magic: application/msword
    treemagic: application/msword
doc.odt:
    magic: application/vnd.oasis.opendocument.text
    treemagic: application/vnd.oasis.opendocument.text
doc.docx:
    magic: application/vnd.openxmlformats-officedocument.wordprocessingml.document
    treemagic: application/zip