While Crystal Edit doesn't allow you to package music into your mod, the game does actually have support for custom music. It's important to note you can only replace music with this. If you wanted to give unique music to something, such as having a boss play its own track instead of the usual boss 1/2/3 music, you can't do that unfortunately.

引用自 River Running Games：

Good news, the game is actually compatible with BGM modding right now! I haven't written any documentation about it, but you don't have to do anything with the .dat files. Rather:

• Navigate into the game's directory, then into Content/Audio.
  
• Open the bgm.config file. This is an index of all the songs used in the game.
  
• To replace a song, edit the song's Path property to the file name of the music you would like to replace it with. (mp3 and ogg only, mp3 works better)
  
• Create a new folder in the Content/Audio folder called "BGM".
  
• Place the new music file into this BGM directory. The game should find it there as long as the name of the file matches the name in the bgm.config file.
  
• You can set the loop points in bgm.config too.

I hope this helps. I didn't really intend for this to be done so it is kind of experimental, but I knew that someone might want to do it.

引用自 Adi：

While Crystal Edit doesn't allow you to package music into your mod, the game does actually have support for custom music. It's important to note you can only replace music with this. If you wanted to give unique music to something, such as having a boss play its own track instead of the usual boss 1/2/3 music, you can't do that unfortunately.

引用自 River Running Games：

Good news, the game is actually compatible with BGM modding right now! I haven't written any documentation about it, but you don't have to do anything with the .dat files. Rather:

• Navigate into the game's directory, then into Content/Audio.
  
• Open the bgm.config file. This is an index of all the songs used in the game.
  
• To replace a song, edit the song's Path property to the file name of the music you would like to replace it with. (mp3 and ogg only, mp3 works better)
  
• Create a new folder in the Content/Audio folder called "BGM".
  
• Place the new music file into this BGM directory. The game should find it there as long as the name of the file matches the name in the bgm.config file.
  
• You can set the loop points in bgm.config too.

I hope this helps. I didn't really intend for this to be done so it is kind of experimental, but I knew that someone might want to do it.

Oh, replacing the music is exactly what I want! That's great to hear!

I went too ahead of myself and I was looking into unpacking the bgm.dat file haha. Good to know it'll be simpler than that!