A .map file is simply a single line of text, with two terms separated by a space. When there are multiple entries in the .map file, the text resembles two columns.
The first column in the .map file is for the string you want to search for in the atom file, and the second column is the string that contains the replacement content for the scene.
To create a .map file:
The file should resemble this:
...and so on.