custom launchers and unity

So i made a launcher using visual studio and have it set up to do all the normal jazz that unity can do with its generic input screen. now if i click my launcher exe and do its options and what not and hit play it will load up the unity game but im wondering if theres a way to set this launcher exe as the only exe to open the game or if i im forced to package it along with it? ive read some things about making the launcher a .dll file but im not seeing where that can come into play from inside unity. so any info on this would be great thanks!