What Is a BRSTM File?

How to open and convert 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.

The programs below let you open the file on a computer as well as create your own BRSTM file from existing audio data.

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

BRSTM files

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 Media > 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 parameter to search for All Files instead of just the regular media file types that the program opens.

BrawlBox is another program that can open these files. It's 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. 

How to Convert a BRSTM File

The BrawlBox program mentioned above can convert BRSTM to WAV through Edit > Export. In the "Save as type:" section of the Save As window, be sure to choose Uncompressed PCM (*.wav).

If you don't want the file to remain in the WAV format, you can then use a free audio converter to convert WAV 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: convert WAV, FLAC, MP3, and OGG files to BRSTM. When finished, the 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.

Still Can't Open It?

If the file doesn't open at this point, after trying the suggestions above, there's a good chance that you're misreading the file extension. When this happens, you're trying to open a file in an incompatible program, which will most likely lead to errors.

It's easy to confuse other file types for this one because some file extensions are really similar. A BST file, for example, might at first appear related to a BRSTM file, but it's really a BibTeX Style Document. Another is the Exchange Streaming Media file format that uses the STM file extension.

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