This property defines the filename that will be used to save the created file, and is also used by the report designer to open the correct file when you double click a TFlexCelReport component. 

Note that if you call TCustomFlexCelReport.Run (TStream, TStream) this property is not used. 

For this Demo to Run, drop a TFlexCelReport, a TXlsAdapter, a TButton and a TOpenDialog on a Form. Connect the XlsAdapter to the FlexCelReport. 

procedure TFPrinting.Button1Click(Sender: TObject);
begin
  if OpenDialog1.Execute then
  begin
    FlexCelReport1.Adapter.AllowOverwritingFiles := true;
    FlexCelReport1.FileName:=OpenDialog1.FileName;
    FlexCelReport1.Run;
  end;
end;

TCustomFlexCelReport Properties