For most media things I still like Winamp. You can just play stuff in it, it keeps your position and it doesn't have all that library star ratings add to this, buy from that, create playlist other crap on the interface that a lot of media players do, it just plays stuff.
all you need to do is set the skin to classic and turn off everything but the main window. Oh, and as a bonus it plays lots of cool game formats too with the chipamp plugin.
I assume it works on windows 10 since it definitely does on Windows 7, though you might need to install some dependencies, (I actually do hope it works on Windows 10 since I'll be getting a new windows 10 machine around christmas).
if not vlc media player is worth investigating, it's what I already use for dvds, though I don't know how easy to use it's standard sound file playing is or whether it has too much unwanted crap in the interface like unfortunately most players, windows media player included.
Then again I'm someone who really doesn't like all this library functions, playlists, star ratings, suggested downloads, likes, facebook plugins and other such that most people seem to think are a good idea to have in music playing programs these days, (another reason I really can't stand Itunes).
I prefer to organize my stuff, audiobooks, music, dramas or whatever myself with folders and subfolders and such, so my main requirement of a media playing program is just that it, ---- well plays media, without having to fight my way through all sorts of unnecessary clutterage on the way .
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)