The title bar of Windows Media Player displays Windows Media Player by default.

If you wish to change the title bar to read Windows Media Player provided by XXXXXXX, where XXXXXXX is a text string:

1. Copy / Paste the following into a WMP.reg file:

REGEDIT4

\[HKEY_CURRENT_USER\Software\Policies\Microsoft\WindowsMediaPlayer\]
"TitleBar"="XXXXXXX"

2. Merge the WMP.reg file with the registry, or run regedit /s WMP.reg.