The sound files must be in the game's audio.bag, which is one file containing all the in-game sounds, with their locations identified in audio.idx. That's the only place the game reads sounds from (EVA sounds are the exception).
XCC Sound Editor can create a new audio.bag and audio.idx for you when you add your sounds. To avoid distributing audio.bag with your mod (it is a very large file), use XCC Mod Launcher/Creator, so you need only include your new sound files, and not what everyone has already anyway. It will write these new audio.* files on the user's machine on mod launch.
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