https://www.epo.org/en/applying/myepo-services/understand/online-filing-20-pilot-continuation

Online Filing 2.0 pilot project for DOCX filing

This pilot project is now complete and no longer active.

The European Patent Office (EPO) now offers the possibility to file submissions using DOCX format. This includes patent application documents and any other document you may wish to file with the EPO using MyEPO services:

MyEPO 
Online Filing 2.0 
Contingency Upload Service 
Third Party Observations