.BREFF File Extension
What is a BREFF file?
Game file created for Nintendo Wii games such as Mario Kart and Super Smash Bros. Brawl; contains control information for the behavior of different gameplay effects, such as fire from falling bombs and smoke from vehicles drifting around turns.
BREFF files are located with .BREFT files in the "effect" folder of the game directory.
NOTE: You can open and edit BREFF files with BrawlBox.