If you don't know what the .map file is for, you don't need it. I just provide it so it's easier to use tools like Stroop and Star Display.

File Select will be in 4:3 because it would be misaligned otherwise, but once you select a file it will switch to 16:9. You can toggle between 4:3 and 16:9 by pressing L in the pause menu.

Enjoy!