Xmind mind mapping software supports several formats for exports, including CSV format, so in this sense xmind to csv conversion, or export in this case, is certainly possible. As for practical reasons for this, perhaps it's just export of some table data and alternative to MS Excel format.
Not every export function might be available in the trial/free version though, but there is most likely no alternative how to otherwise export .xmind files.
Updated: October 4, 2023