Those three files are example files fetched from ECB website.

• euroxfref-daily.xml: exchange rates on 2024-02-27.
• eurofxref-hist-90d.xml: time series file containing last 90days exchange rates
• euroxfref-hist.xml: is equal to eurofxref-hist-90d.xml, but logically is time series file containing exchange rates for the whole period. Copy of euroxfref-hist-90d.xml is used instead to save disk space.