GraphicRiver authors create the CV directly in Word?

Hello, I realized that in graphicriver when an author creates a CV, Cover Letter and Resume it saved in .doc and .docx format.
Could someone give me a hint how this process works?
It is exported to a file that is known .AI, .EPS, .PSD, IDML, INDD?
The author creates the file again in Word? If so, how it is oriented on the issue of dimensions that are different between the software

Grateful to anyone who can help me understand this process