To open or run any application when windows PC or desktop starts, go by the given below steps.
Find the application .exe file
For e.g: To set the Firefox browser to open at startup. Search Firefox > Right click on App > select Properties or Open File Location.
Create shortcut of the file
Go to path where .exe file or shortcut is placed > Right click and select ‘create shortcut’.
Place shortcut file to the following path.
You can check by opening Task Manager, it will appear in Startup Tab.
You can enable or disable it from this Startup tab.
Restart your computer
To test this, restart your computer and added application (e.g Firefox) will open up automatically.