This is a HOST ONLY program to force your game to cycle to the next coop mission. It uses an XML mission list that has all the stock missions already loaded. If you have custom mission files packed into your PFF file you can add them to the XML file and it will cycle in the order of the missions in the file. All you need to do is start this along side your game at any time and keep it running. If you are looking for the client, go here: http://novahq.net/files.php?ID=577.
Clients can still play in your server without the client fix, they will just have to rejoin after every mission.
For this to work, the host should not hit enter at the end of the mission. It will automatically cycle to the next mission in ~30 seconds.