On these versions of Windows, you can simply open your Start menu, locate a shortcut to an application you want to start automatically, right-click it, and select Copy. On Windows 7 and earlier versions of Windows, the Start menu contained a 'Startup' folder to make this easy.
Related: How to Add a Program to Startup in Windows 10 or 11 Windows This is particularly useful for background applications or tools that automatically perform a function, but you can even add desktop applications and they'll pop up when you log in.