“Browse for Subtitles” shortcut

First of all, I know the question is off-topic, but I have tried in the subtitles addon section and they couldn’t help me there. If it needs be I will remove the post. Just know that I have tried lots of things before posting here.
Thanks in advance.
I am trying to map to a Key the “Browse for subtitles” window under video mode. Notice it is NOT the “Subtitle Search” window, which I have already mapped.
That window can be accessed through the Sound submenu in the fullscreen video OSD.
I have been trying to finde an action that summons that window and I have tried too to find that window name so can I can invoke it through “ActivateWindow(HowEverTheHellitisNamed)“, but I haven’t been able to find the slightest reference to it.
Please, does anyone know how to summon it?