If you really just want to start directly the game, then start the exe in your RO folder which is running when the game is running.
That would directly start the game, and that without the patcher.
If you dont know which files belong to the patcher, you cant delet it.
In majority of cases the folder that affiliate to the patcher is called : neoncube, patcher, or something like this.
BUT if you run the game then though the patcher exe, you WILL get an error, cuz the patcher does not find his files.
As I said the easiest way is to start the real game exe.
Hideki