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If you want to launch only one program (karaoke player) you can try EasyApps plugin

https://www.team-mediaportal.com/files/Download/Plugins/Automation/EasyApps/

Then you can use My Programs to launch games and EasyApps to launch karaoke player.

If your karaoke files are cd+g/mp3 you can launch them from My Videos. Just add .cgd extension to My Videos configuration. More info here: https://forum.team-mediaportal.com/showthread.php?t=2269