Newer Super Mario Bros. Wii Audio
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What is an ER file?
An ER file is an audio file used by Newer Super Mario Bros. Wii, a fan-made sequel to Nintendo's New Super Mario Bros. Wii. It contains a sound effect or music played in the game. ER files are similar to the .BRSTM audio files used by official Wii games.
Gamers who have homebrew-enabled their Wii or use the Dolphin emulator can download and play Newer Super Mario Bros. Wii. When downloaded, the game arrives as a .ZIP archive. Decompressing this archive allows you to view the game's constituent files.
The game's Music subdirectory contains a series of ER files. These files are used to play in-game music and sound effects. Many of the ER files that contain music are named for the level in which they are used.
How to open an ER file
You can use BrawlBox (Windows) or VideoLAN VLC media player (multiplatform) to open ER files and listen to the audio they contain.