I'm afraid there's not much you can do about that problem.
I have the same issue. It depends on what sound card you have. Some people hear the new sound effects, others don't. It appears to be a bug in the game. It doesn't always play back custom sound effects on everyone's machine.
It has something to do with precisely how the sound file is formatted (bit rate, frequency, mono vs. stereo, etc). As you found out, the sound effects work fine outside of the game. But not in the game itself.
I could try reformatting the sounds in a different way, and post them somewhere for download. Reformatting them might do the trick. I'd have to test it.
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