Could you please share a screenshot of your flow's configuration?
Do you get the binary data within your email body?
Further, do you want to get the actual content of the .docx file rather than the binary data within the email body?
I afraid that there is no way to achieve your needs in Microsoft Flow currently. There is no way to analyze the binary data in Microsoft Flow currently, if you would like this feature to be added in Microsoft Flow, please submit an idea to Flow Ideas Forum: