In this text i will tell you how to have X-rays.
Its a lilttle probability that it might not work on normal computers,but i am pretty sure that it will work on laptops.
Open the game and press window button.Now transform the game from fullscreen to window.Then open ‘‘video’‘ up the window,and select 32 bit.The re-make the game fullscreen and continue playing.In a few moments it should the colors will change and you will be able to see on very dark maps.To stop it go back to video and change 32 bit with 64 bit.
I have a laptop and to me it works,but it might not work on normal computers.If it works contact me,so i can see to how many peoples it works.
Have a nice day!