BDeka

Hey, me and my friend are trying to get together on our own Tekkit Server, but he needs help. In the Client he was having block ID issues, and we tried to fix that but nothing worked. So he was going to delete the Tekkit folder, but it said that something in there was opened or was being used. The problem is that nothing but the .technickpack folder was opened, and it still said that something in there was opened. Any help?