Client Name Issues

Hi Guys

Anyone had experience with renaming their client side file?

I use the Admin.exe but if I name it Game.exe or Client.exe or anything other than Admin (even Admin1.exe) it wont even try to connect to the server, just gives me instant "Unable to connect to server"

As soon as I change it back to admin.exe it works fine,
Had a brief search through the hex of it but cant find anything, looked through hotuk.ini (clientside), ptreg.rgx, game.dll

cant find anything relevant.

HALLLPPPPPPPPPPP