I've been playing Nancy Drew: Secrets Can Kill so I can make an "Everything Wrong With" video for it. I took a brief glance at the audio files for this game, and man, there is a lot of stuff that didn't make it into the game itself. Things like the Nancy Drew rap, for example.
Accessing the audio is difficult, because the game is so old. What you have to do is import the audio files as raw data, in an audio editor. Even then, the audio comes out weird. It took me a while to figure out that the audio sounds good, only if you adjust the sample rate to 22050 Hz while importing. That's half of the recommended rate.
(I have no idea what that means. I'm sure some audiophiles do.)
Even then, the audio has a one in three chance of sounding weird, and I have to use the "change speed" option to prevent everyone from sounding like chipmunks.
I'm going to slowly make my way through these audio files! Maybe make a video of all the possible conversations in the game, or something. Some of the unused music is pretty good, so I'll at least try to put that on YouTube at some point.