Directly opening a houdahspot search (.hssearch file)

I’m trying to make use of the technique explained in this forum post about houdah spot and on K. Dini’s blog, using the script presented here.

It boils down to opening a hook link to a .hssearch file.
The hook link is something like this:

And the script boils down to performing
do shell script open hook://file/ksEVvbWEa?p=RG9jdW1lbnRzL3NlYXJjaGVz&n=48hours.hssearch

Unfortunately this opens the finder and shows me the saved search. What I really want to do is to open the actual .hssearch file in one fell swoop.

But I’m not sure how to do it? Is anybody using an updated version of these scripts?