It is bound to happen. You will have a developer come up to you one day and say, "Remember the DLL file that we shipped in the previous release, we have consolidated its functionality into the core library. We need to remove that library in the latest release." You as a Windows Installer developer would then be frustrated after finding out that you cannot remove components during a minor upgrade and you will have to manage with all the ugliness of a major upgrade. I will write about the ugliness...