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