I undestand but if the prog is not on the list (as me), you can force open by the button "travel" (?) folowing the double clic in windows :)
And if you enable "always open this sort of file with this prog", an icon with your "Yellow light" icone is created !
And that works perfectly, for this time I have try all the manipulation :)
Each time I save a file from moi, the 3dm file + moi's icone is created on my desk :)
And start launch directly when I clic the new saved name file iconed :)
Even Moi has not the first automatic links information for the 3dm windows shell (that you want to do) after my little manipulation that pretty works ....
So now I don't understand the problem :D