How to use "Volume fire.setting"?

Trying to make particle fire with F8 (windows).
I found this "Volume fire.setting" in the Fusion\Templates\Volume folder.
It should be a macro but I really don't know how to "open" it it to see how it's built.
In a comp it gives only access to one "fire detail" control but I'd like to see how it's done.

Any help on how to work with (what seems to be a) macro?

Copy the node from fusion to a text editor
Change "MacroOperator" to "GroupOperator"
Copy and paste the whole text back into fusion

Now you should have a group node which can be opened and you can see the tools inside

Thanks Michael