In the registration editor (regedit.exe) find:

  • Context menu for right click on folders in left panel of Windows Explorer or on background of a directory in right panel:

    1. HKEY_CLASSES_ROOT\Directory\Background\shell if you are administrator
    2. HKEY_CURRENT_USER\Software\Classes\directory\Background\shell if you are a normal user
  • Context menu for right click on folders in right panel of Windows Explorer:

    1. HKEY_CLASSES_ROOT\Directory\shell if you are administrator
    2. HKEY_CURRENT_USER\Software\Classes\directory\shell if you are a normal user
  • Context menu for any file:

    1. HKEY_CLASSES_ROOT\*\shell if you are administrator
    2. HKEY_CURRENT_USER\Software\Classes\*\shell if you are a normal user

In all cases:

  1. add a new key under shell, naming it as you want to name the context menu item
  2. add a new key inside this key, named command (mandatory name)
  3. edit the default property in command to myprogrampath\path\path\executable.exe %1 to pass the file path and name of the selected file to your custom program

More customization:

  • Add icon : add a string value named icon for key created at step 1 with value matching an icon resource path. You can also provide an integer arguments to specify which icon to use. Example: %SystemRoot%\System32\shell32.dll,3
  • Display only on shift-click : adds an empty string value named Extended for key created at step 1
  • Customize menu entry label : change the value of default value for key created at step 1
  • Change menu entry location : add a string value named Position with one of: Top, Bottom