if (global.osflavor <= 2)
{
    return file_text_readln(argument0);
}
else
{
    var handle = argument0;
    ds_map_set(handle, "line_read", 0);
    var line = ds_map_set_post(handle, "line", ds_map_find_value(handle, "line") + 1);
    if (line >= ds_map_find_value(handle, "num_lines"))
        return "";
    text = ds_map_find_value(handle, "text");
    return text[line] + "
";
}