I've been given a task to create a protocol similar to callto:, that would automatically launch an installed application upon clicking on a link with it.

I followed the Microsoft guide on how a scheme should look like.

My scheme looks like this:

HKEY_CLASSES_ROOT
    slican
        URL Protocol = ""
        DefaultIcon (Default) = "C:\Users\Okabe\Desktop\slican\SlicanP.exe,1"
        shell
            open
                command (Default) = "C:\Users\Okabe\Desktop\slican\SlicanP.exe" "%1""

I thought that was all, and tested it with:

test link
test telephone link

There was no reaction whatsoever. Internet Explorer asked me if I want to search for a program that can open the content, and Chrome responded with nothing, as if I clicked javascript:void(0).

How to get this working?