Hey!
Apparently you are David Ius, or just a user, since you went into this folder with a manual installation :)
If you opened this Readme!.txt first, it is advisable to go to another folder and read that Readme!.txt
because it describes the subtleties of fashion.

David Ius, you don’t have to read, you yourself will understand what to do)

Firstly, we take any archiver, even though the explorer itself and open AoC2.jar, the one at the root of the game, as an archive
Open as archive AdvancedSource.jar,
we take the age folder from AdvancedSource.jar and transfer it to the AoC2.jar archive that is at the root of the game.

Throw these lines into the language file somewhere:

# MODIFICATION ADVANCED AUDIO
# Developer Artem Alaverdyan, VK: vk.com/mega4oss, Discord: !Nightmare.#1717
MusicList = Playlist
ChooseMusic = Select a track from the list
PreviousMusic = Previous track
NextMusic = Next track

Everything! You can go listen to the music of the game through a more convenient player or watch the ruthless bugs of the aoс universe.
Have a nice game!

Mod developer: Artem Alaverdyan, or Mega4oSS
VK: vk.com/mega4oss
DS: !Nightmare.#1717
Phone number: 88005553535