This clip has no sound in my WMM. It's a mixed bag. I recorded several episodes of Cosmos using the AVer device; some have sound in WMP and WMM, some do not.
I also recorded last night's 60 Minutes and Good Wife on my iView, then transferred the recordings to my PC. Both recordings have sound in WMP and WMM. But an iView recording from last week did not have sound in WMP or WMM.
Because the same issue occurs in 2 completely different recording devices, my hunch is that it's not the recorder. All these recordings, by the way, play back with sound in the original recording devices.