https://www.epo.org/en/node/notification-and-publication-sequence-listings-0

In which format are ST.26 and ST.25 sequence listings available in the European Patent Register?

In the European Patent Register, sequence listings in ST.26 XML format are displayed with the identifier Sequence listing in ST.26 (.XML) in the list of document types in the All documents view. The document type identifier for sequence listings in ST.25 TXT format is Sequence listing. 

For more information, see New standard for sequence listings now visible to users