Shamelessly copied from quick reference : add-open-command-window-here-windows-10-context-menu by editing registry keys
Adding ‘Open command window here’ Option to the Windows 10 Context Menu of a Folder
Step One: Press Windows key and + R from the keyboard to open the Run
command. Type regedit and then hit enter from the keyboard to open the
registry.
Step Two: Go to the following path:
HKEY_CLASSES_ROOT\Directory\shell\cmd
Right-click the cmd key. Scroll to Permissions and then click it.
Step Three: Click Advanced.
Step Four: Click the Change link.
Step Five: Type your user account name and click ‘Check Names’ to
verify it. Click OK when you are done.
Step Six: Check ‘Replace owner on subcontainers and objects’. Click
Apply and then OK.
Step Seven: In ‘Permissions for cmd’ window, select the Administrator
account. Check Allow for full control option. Click Apply and then OK.
Step Eight: Inside the cmd key (right window), right click
HideBasedOnVelocityId and then click Rename.
Step Nine: Rename the DWORD from HideBasedOnVelocityId to
ShowBasedOnVelocityId, then hit Enter from the keyboard.
You are done. When you press shift from the keyboard and then
right-click on any folder, you will have the ‘Open command window
here’ option on the Windows 10 Context Menu.
Adding ‘Open command window here’ Option to the Context Menu of Background
Here are the few steps you need to take:
Step One: Press Windows key + R simultaneously to open the Run
command. Type regedit and hit enter from the keyboard to open the
registry.
Step Two: Go to the following path:
HKEY_CLASSES_ROOT\Directory\Background\shell\cmd
Step Three: Right-click the cmd key and then click Permissions.
Step Four: Click Advanced.
Step Five: Click the change link on top of the window in front of
owner option.
Step Six: Type your user account name and click ‘Check Names’ to
verify it. Click OK when you are done.
Step Seven: Check ‘Replace owner on subcontainers and objects’ option.
Click Apply and then OK.
Step Eight: In permissions window, choose the administrator user.
Check Allow for Full Control option, click Apply and then OK.
Step Nine: Inside the cmd key (right window), right-click the
HideBasedOnVelocityId DWORD and then click Rename.
Step Ten: Change the DWORD name from HideBasedOnVelocityId to
ShowBasedOnVelocityId and press Enter from the keyboard.
That’s all. When you press shift and right-click anywhere on your
windows background, you will have an option of ‘Open command window
here’ as shown in the following screenshot from Windows 10.