Open another windows program via ingame decision

I want to make a tensy tiny mod, so small you'll probably laugh at it.

What I want to do is have a list of decisions that when pressed, opens custom localization files/ whatever else in file explorer. so that the user from there can just edit names of countries/leaders/whatever else in the localization via text editor.

So to recap, if i wanted to rename the country to "Anarchist commmune" I press a decision to open in file explorer MODNAME/localization/english/countries_l_english and then I can change the localization file from there.

i know its possible to open another program ingame, like with the errors file when you open in debug mode, or the internet browser mod. But how exactly?