Invalid character when exporting to Flash CSV

Question

When I export a DataGrid for .csv the characters of my header which contains invalid-formatted fictional accents.

private function onExportToCSV():void
        {
            var fileReference:FileReference = new FileReference();
            fileReference.save(DataGridDataExporter.exportCSV (dgLigacoes,';',';'),'LogLigacoes.csv');

        }