The Book

http://www.thewindowsclub.com/startup-folder-in-windows-8

The Current Users Startup folder in Windows 10/8 is located at:

C:\Users\%username%\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
or
%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup
because
%APPDATA% = C:\Users\%username%\AppData\Roaming

These programs start up for the current logged in user only. To directly access this folder, open Run, type

shell:startup

and hit Enter.

Or to quickly open the folder, press WinKey, type shell:startup and hit Enter. Startup folder in Windows 10

The All Users Windows 10/8 startup folder is located at:

C:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp
or
%PROGRAMDATA%\Microsoft\Windows\Start Menu\Programs\StartUp
because
%PROGRAMDATA% = C:\ProgramData

These programs start up for all users. To open this folder, bring up the Run box, type

shell:common startup

and hit Enter.

Or to open the folder quickly, you can press WinKey, type shell:common startup and hit Enter.