To get to the SendTo folder, you’ll need to open up an Explorer window, and then paste in the following to the address bar.
%APPDATA%\Microsoft\Windows\SendTo
%APPDATA% is an environment variable that actually maps to something like C:\users\<username>\AppData\Roaming.
You should now see a bunch of shortcuts.If you wanted to add an item to the Send To menu to open files in Notepad. You could just drag a shortcut to Notepad into this folder, or create a new shortcut. Now you can see the new Notepad item in the menu