INI
From Mario Fan Games Galaxy Wiki
INI is a simple, text-based, and human-readable format for storing information. In fangames, they are generally used as a method of storing save data, but save data stored in this way can be easily edited unless encrypted.
Information in INI files is stored in a group-item-value format as follows:
[group] item = value item = "string"
Quotes for strings are optional.
Multiple groups can be used, but they must use different names; also, a given group cannot contain two items of the same name.
INI files should be small, and in fact Windows places a 64KB limit on their size.