C# button script to FiveM server

Hey guys, i want to make a little simple tool with some buttons to join the servers what i want. But everytime when i want to join a server then i will get a error message. The code what im using (in visual studio 2017) is:

    private void button1_Click(object sender, EventArgs e)

A normal link like youtube is working correctly but only joining fivem servers i will get a error from fivem .

custom launchers are not supported or allowed on FiveM, as it’s clear that is what you are trying to do

Yeah that is what im trying to make but i didnt knew that it was not allowed because i had it earlier, i think now about 2-3 years ago so yeah. No one told me that its not allowed but now i know. Thnx