This is a per-user tweak.
Open Run> Type: regedit > Press Enter
Browse to the following key:
HKEY_USERS\S-1-5-21-xxxxxxxxx-xxxxxxxxx-xxxxxxxxxx-xxxx
\Software\Policies\Microsoft\WindowsMediaPlayer
(the x's will vary from computer to computer , it's the key without the "_Classes" at the end) Create the following String, "TitleBar" , the value of this will now become the TitleBar of Windows Media Player.
