Windows 10, WMP 12 and FLAC files

Mp3tag + Winamp? Yuo can read about it here: Unofficial Mp3tag & Audio Efficiency Guide V.1 - #4 by Zerow

I would only use WMP if Microsoft would pay me to do so. [But I do use Media Player Classic for videos, having switched from a very long usage of other players- but that is whole different story]