Options.txt

options.txt is the file that stores all the options changeable in the in-game options menu and various other information the game needs to store after quitting. It is found in the .minecraft folder and can be edited with any basic text editor to change your options. A couple of settings can only be changed by editing this file, but most can be changed in-game.

Options
Each line represents a single option or piece of data, with the option followed by a colon followed by the value of that option.