This is great! A little rough around the edges though.
You've only done filename checking for Windows, Mac uses / instead of \, so I get the entire path for the "Now Playing" portion, which wraps around making it rather ugly.
I'd suggest in addition to fixing the filename issue, truncating the filename just in case it's very long anyway.
Other than that, it's pretty good so far, and I look forward to an update! I'm using this right now. I am now slightly lazier.