I'm on Windows 10 1809. I have installed SysInternals Process Explorer and have it substituted for Task Manager.
I now need to add an application to the "Startup" list. I can see the Startup list in Control Panel, but I don't see a way to add to that list. The only way I'm aware of to add to that list is through Task Manager, which I now cannot get to, and there doesn't appear to be a substitute option in Process Explorer.