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This works for RTF, but if you try and append an RVF file, it automatically clears beforehand as you can see below.
Should the "Clear" in this routine be removed to make it consistent with the RTF import?

function TCustomRVData.LoadRVFFromStream(Stream: TStream; var Color: TColor;
Background: TRVBackground; Layout: TRVLayoutInfo
{$IFNDEF RVDONOTUSESTYLETEMPLATES}
; ReadStyleTemplates: TRVStyleTemplateCollection
{$ENDIF}):Boolean;
begin
Clear;
Result := InsertRVFFromStream(Stream,0, Color, Background, Layout, True
{$IFNDEF RVDONOTUSESTYLETEMPLATES}, ReadStyleTemplates{$ENDIF});
end;

Actually appending a RVF file to one you have already opened is not done so easily.

Forget all previous. Just use "AppendRVFFromStream"

AppendRVFFromStream ignores attributes of the first paragraph in RVF (a style specified in the parameter is used instead).

If you just need to add to the end, use InsertRVFFromStream, pass ItemCount to the Index parameter.