However, you don't need to install third-party skins or hacks to get a darker look. There is a native feature built right into the player that most users forget about.
After testing all methods, here is the final verdict: windows media player 12 dark theme
Use a third‑party dark skin (recommended for closest visual match) However, you don't need to install third-party skins
Open the new app and click the Gear (Settings) icon. windows media player 12 dark theme