The file contains sections for various controller IDs. A standard entry for a generic or Xbox 360 controller typically looks like this:
: It maps generic "Button 1, 2, 3" inputs to standard "A, B, X, Y" (or PlayStation equivalent) commands used by the game's engine.
The file contains blocks of code for different controller IDs. A typical entry looks like this: fifaConfig/buttonData.ini at master - GitHub