DWFX are AutoCAD Design web format files and follow Open Packaging Conventions.
Tika "correctly" detects these files as application/zip.
It would be better if Tika could recognize the true mimetype: model/vnd.dwfx+xps.
Please add logic in ZipContainerDetector in such a way could be possible to detect dwfx. We need a method behaving like detectOfficeOpenXML(OPCPackage pkg):