You might be able to extract data from the file using Dragon unPACKer, a utility designed to unpack data files from various video games. It contains a 'generic file unpacker' addon that looks for sound, image, and video files that might be contained in any file you throw at it. There's a chance it won't work, but I'd definitely say that's your best bet.

Otherwise, you could always fiddle with importing the .snd file into Audacity with the 'raw import' dialog and playing with the settings until it works...

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