1Open Terminal Utility: You can view it in the Utility subfolder of your Applications folder.
2
In the command line . textutil -convert docType: Do Returnnot press the button right now.
3
Drag the desired DOCX file that you want to convert into terminal window: The file path will be added to the command you provided.
4
To convert files . ReturnPress: It may take some time. The new DOC version will be saved to the same place instead of the actual DOCX file