configFile.yaml or configFile.yml

yaml

same for html instead of htm.

config_file.yaml embrace the snake case

whatever the default extension needed by the library im using. i dont have a horse in this race

On Linux, there is no reason to use 3 characters extension as the max path length is 4096 characters, so I'll just use the most descriptive filename and extension. I can see the need to use the shortest extension possible on windows though with its limited 256 max path length.

depends on whether its yet markup language or yet another markup language

.yml 😅