.er

Note: To import custom music into the game, see these two articles Custom Music and Additional Music Slots

The .er file is a file format used by Newer SMBW for music and sound. It is identical to a .brstm file, just with a different file extension.

Using a .er File
You can use a .er file in BrawlBox/BrawlCrate by changing the file extension to .brstm. The two formats are identical to each other.

Trivia
There is a small joke hidden in the name of these files. If you patch an ISO with NewerSMBW (highly unrecommended nowadays), these files will be in. If you take the file extension and the folder name, then put them together, you will get 'newer'.