GitHub Atom: How to apply a particular syntax highlighting to some files based on name

Question

How can I configure GitHub\'s Atom to make it automatically set a particular syntax highlighting to filenames based on name and/or extensions?

Specific

Answer 1

Anyone arriving here looking to add support for template files in php e.g. .tpl, the folloing works in atom 1.10.2. I do not have previous versions so I can't say about earlier versions.

Add this in your config (config.cson) after core:. I added it after audioBeep: false line.

customFileTypes:
   "text.html.php": [
    "tpl"
   ]

Documentation made me go around in circles. Several articles wrongly mention source.php where as it should be text.html.php

Just getting started with atom coming from npp++ basically as I have struggled with snippet support there and hope atom can do a good job.