[BezDelnik]

private function saveFile(filePath:String, data:String):void {
	var file:File = File.documentsDirectory.resolvePath(filePath);
	var fileStream:FileStream = new FileStream();
	fileStream.open(file, FileMode.WRITE);
	fileStream.writeMultiByte(data, "Windows-1251");
	fileStream.close();
}

я сохраняю так