Sadly, WMP hasn’t been updated since Windows 7, which doesn’t mean it doesn’t work, but it’s not exactly the latest nor greatest app for playing your MP3s.
In Windows 10, there’s a new music app called Groove Music.
Google "Groove Music" without quotes.
To find WMP in win 10, click Start and type: media player and select it from the results at the top.
Alternately, you can right-click the Start button to bring up the hidden quick access menu and choose Run or use the keyboard shortcut Windows Key+R. Then type: wmplayer.exe and hit Enter.
Note: Microsoft removed DVD playback support back in Windows 8, so you won’t be able to use WMP for them. However, there are plenty of third-party utilities (hint: VLC)