How to add new items to right-click event on Folders and Files in Windows?

Question

I did google couple of tutorials on google.

I am able to add right-click menu item to a FOLDER by doing this:

[HKEY_CLASSES_ROOT\\Di         


        

Answer 1

1. Files have context menus by extension. Add your Command registry keys to the appropriate extension or HKEY_CLASSES_ROOT\* to affect all files.
2. You can use %1 to pass the filename to the application (much like you've indicated with %L above). If you select multiple files, each will be called separately, as if you right-clicked each one individually.

I'm not aware of any easy way to pass multiple items from a right-click context menu to one executable instance.