What does the game config file do?

[Dunc1n]

Ok, so I am struggling with getting some of my mods to work, and a few people have mentioned downloading and adding a new game config file, but there are loads to choose from, and I don't know exactly what the game config file does, so I don't know which one to download and install.
Please help

Cheers

[AHK1221]

@Dunc1n This one.

Install that one.

[eshenk]

@AHK1221 The undisputed king of all gameconfigs.