I have introduced a new drop down item ‘Encrypt’ at right click to
all file types – therefore I had to add it in the registry as :

HKEY_CLASSES_ROOT*shellEncrypt

Now this drop down would be visible to all type of files at their right click.

But I also have files of type .crypt
HKEY_CLASSES_ROOT.crypt

HKEY_CLASSES_ROOTencryptedfile (encryptedfile is defined of type .crypt)

Now I DO NOT want this drop down Encrypt to be visible when I right click files of type .crypt (or encryptedfile)

For the rest of the files the menu Encrypt should be visible (enabled).

How can that be achieved?

I wish to implement this functionality by command line Registry
modification, not by some third party tool or through C++, C# code

Thank you very much