Where is the MISSION LIST populated?

The Mission list appears to be an array of all the files located in "*/missions/*.mis".
I'm not sure, but I'm guessing its an array of all the files in that folder.

I am writing a custom script to only display certain missions based on certain conditional variables based on $pref::Player::Name


In ~\server\init.cs I see this

// Specify where the mission files are.
   $Server::MissionFileSpec = "*/missions/*.mis";

But I need to find the part where is says ("Ok, now here are where all the possible missions are.....ONLY DISPLAY these certain ones....")

Please advise ! Thanks.