I have tested the Manuscripts and paid for it. But I have found the docx file exported by Manuscripts can't be opened by neither Mac office nor Windows office.
The error message in Mac Office is "Can't open Open XML file ***.docx."
The error message in Windows Office is "Microsoft Office cannot oepn this file because some parts are missing or invalid."
I have used some Manuscripts files to test. All exported files have the same problems.
Here is the my mac config:
Mac office 2016. v15.15(151008).