Myst MSND resources
These MSND resources are identical to Riven's tWAV resource, with one minor difference: the encoding. Myst uses raw, unsigned 8-bit data (I've only seen it at a rate of 11025) when the DATA chunk encoding is 0. The CUE# chunk is also used more often in MSND resources.
Myst Masterpiece Edition
In Myst ME, MSND resources hold standard Windows WAV files.