You have received or created a DOCX file and you are not able to export to DOC format?
Here is a free and easy way to change the format of your document:
OpenOffice is a free office suite: https://www.openoffice.org/ This is a free alternative to the Microsoft Office suite, allowing you to create or export your documents in different formats.
The procedure is as follows:
Download and install OpenOffice.
Open the file you want to convert with OpenOffice.