The server-code is identical on both, and the classloader runs ‘before’ minecraft runs so it’s not easy to tell if its a client build or not since that code isn’t even loaded yet to check. That’s why I made the config file.
What I’m really curious about is what is changed about the MinecraftServer.class file, I would really like a copy of it, because it doesn’t sound right… Like what is even being run?!