I can't find that info or any way to programmatically disable Dolby and DTS in the S/PDIF settings, so I wrote a stupid Autohotkey script to do it through the mmsys.cpl UI. It's just a series of keystrokes to disable the surround formats. Not ideal, but it has the desired effect on WMC and Kodi and seems reliable. (One must do it while they're not running.)
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