Open, Edit, & Convert BRSTM Files

Screenshot of several BRSTM files in Windows 10 that open with VLC media player
BRSTM Files.


A file with the BRSTM file extension is a BRSTM Audio Stream file used in some Nintendo Wii and GameCube games. The file typically holds audio data for sound effects or background music played throughout the game.

You can not only open BRSTM files on a computer using the programs below, but also create your own BRSTM files from existing audio data.

You can read about the technical aspects of this audio format at WiiBrew.

A similar audio format, BCSTM, is used on the Nintendo 3DS for the same purpose. BFSTM is another file with a similarly spelled extension that's used to hold audio data too, but it serves as an updated version of the BRSTM format.

How to Open a BRSTM File

BRSTM (and BFSTM) files can be played on a computer with the free VLC program, but you'll have to use the File > Open File... menu to open it since the program doesn't natively recognize the file as a supported format. Then, be sure to change the browse parameters to search for All Files instead of just the regular media file types that VLC opens.

BrawlBox is another program that can open BRSTM files. This program is entirely portable, which means you don't have to install it. Depending on the version of the software, the BrawlBox.exe application that you need to open may be in the \BrawlBox\bin\Debug\ folder.

If BrawlBox downloads in an archive format like a RAR or 7Z file, you'll first need to use 7-Zip to open it. 

If you find that an application on your PC does try to open the BRSTM file but it's the wrong application or if you would rather have another installed program open BRSTM files, see our article on how to change the default program for a specific file extension guide for making that change in Windows.

How to Convert a BRSTM File

The BrawlBox program we linked to above can convert a BRSTM file to a WAV audio file through its Edit > Export menu. In the "Save as type:" section of the Save As window, be sure to choose the Uncompressed PCM (*.wav) option.

If you don't want the BRSTM file to remain in the WAV format, you can then use a free audio converter to convert the WAV file to another audio format like MP3. For a quick conversion, we recommend using an online converter like FileZigZag or Zamzar.

Another free and portable tool called Brawl Custom Song Maker (BCSM) can do the opposite. It can convert WAV, FLAC, MP3, and OGG audio files to the BRSTM format. When finished, the BRSTM file will be saved in the program's installation directory and be called out.brstm.

The BCSM application comes downloaded in a ZIP archive, so after you extract the files, just open BCSM-GUI.exe to start the program.

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