Add a program to the Context menu: Regedit

Many times, we may require to open a file using a particular program directly from the right-click context menu.

For a quick example if we want to add Notepad in the context menu, 

Process to add Open in Notepad to the context menu is detailed below :
Navigate to HKEY_CLASSES_ROOT\*\shell.
Create a new key under the Shell key. Right-click Shell and select New > Key.
Set the key name to Open In Notepad. This name is your desired text to be shown in the context menu.
Create a new key under the Open In Notepad key. Right-click Open In Notepad and select New > Key.
Set the key name to command. This setting of key is optional though.
Select the (Default) value in the command key and select Modify.
Enter notepad.exe %1 in the Value data field and click OK.

Another example, if you want to see the command prompt in the context menu,

instead of notepad.exe , you can set cmd.exe.

 

Now right click on any file and you should see and option.  In this example, "Open in CMD".

Additionally, if you want to open a folder in CMD through the context menu,

Hold the Shift key down while right-clicking.  You should see an option "Open Command Window Here" appear.