Default Options is compatible with several standard Minecraft and mod-specific configuration files:

• options.txt: The primary file for Minecraft's internal settings (FOV, Difficulty, Graphics, etc.).
• servers.dat: The file containing the list of multiplayer servers.
• optionsof.txt: Used by OptiFine to store its extensive graphical settings.
• optionsshaders.txt: Used by OptiFine and some shader loaders to store shader-specific configurations.
• Keybindings: While stored within options.txt, the mod treats these with specific logic to allow for better integration across different keyboard layouts.