Ah ha... ok. This stuff had WAV on dxdiag full report lines:
DirectShow Filters:
AVI/WAV File Source,0x00400000,0,2,quartz.dll,10.00.10586.0071
Wave Parser,0x00400000,1,1,quartz.dll,10.00.10586.0071
Audio Renderers:
Default WaveOut Device,0x00200000,1,0,quartz.dll,10.00.10586.0071
Media Foundation Byte Stream Handlers
.wav, {42C9B9F5-16FC-47EF-AF22-DA05F7C842E3}, WAV Byte Stream Handler, Preferred
audio/wav, {42C9B9F5-16FC-47EF-AF22-DA05F7C842E3}, WAV Byte Stream Handler, Preferred
audio/x-wav, {42C9B9F5-16FC-47EF-AF22-DA05F7C842E3}, WAV Byte Stream Handler, Preferred
I thought your suggestion was reasonable since maybe, kind of, sort of, it could be possible that WE and something else that is installed are conflicting in some way. Maybe.
I'll try anything at this point.