In older Windows versions, in MSConfig -> Startup tab you could edit the parameters of a startup application from the Command column.
Now in Windows 10, MSConfig moved the Startup tab to Task Manager, but you don't have any option to do the same.
Am I missing something?
C:\Users\Username\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
or the All Users folder atC:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp
, then you may modify them.