Audio file used by some Nintendo Wii games; may save a sound effect or background music that is looped during gameplay; sometimes copied from a Wii memory card and converted to more common audio formats. BRSTM files can be opened on a PC using BrawlBox, which can also convert them to .WAV files. BRSTM files can also be created from WAV, .MP3, .OGG, or .FLAC files using Brawl Custom Song Maker.