Yeah I have Windows 10 now and it does play FLAC through the Windows Media Player and ALAC and others… great. J River is probably in trouble now, particularly as Windows 10 player now supports more video/dvd codecs…although J River does " Hi Res" which Windows Media Player doesn’t. However it is all irrelevant… I converted my WMA files to FLAC in May on Danny’s suggestion using DbPoweramp and made that folder an organised folder in Roon…it reassembled and arranged my 2 Tbytes of music very well and I haven’t looked back. Roon is now my media player with TIDAL integrated, it is wonderful.