) reveals a structured hierarchy of folders and files, including: Audio/Sfx:

Elias extracted the contents. A flood of .ydr files populated his desktop. hidden_bank_vault.ydr hidden_bank_manager.ydr hidden_teller_desks.ydr

If you extracted, edited, and repacked but the game crashes, you might have broken the archive structure. Here is how to fix it:

Flat, ghostly skins of billboards for "Pißwasser" and the neon glow of Del Perro Pier.