Vlad F,
если речь идёт о VirtualStringTree, то есть следующие экспорты

ContentToHtml(Source: TVSTTextSourceType)
ContentToRTF(Source: TVSTTextSourceType)
ContentToText(Source: TVSTTextSourceType)
ContentToUnicode(Source: TVSTTextSourceType)

TVSTTextSourceType (
tstAll, // All nodes are rendered. Initialization is done on the fly.
tstInitialized, // Only initialized nodes are rendered.
tstSelected, // Only selected nodes are rendered.
tstCutCopySet, // Only nodes currently marked as being in the cut/copy clipboard set are rendered.
tstVisible // Only visible nodes are rendered.
);

Также, в версии на гитхабе есть функция SaveToCSVFile(const FileNameWithPath : TFileName; const IncludeHeading : Boolean) : Boolean;