Addonpeds, I think.
Since I renamed my mods folder, Open IV created a new mods folder, and if I'm in game, I don't have my car mods, ELS, uniform pack, addonpeds, etc.
Edit: I'm 83.7% sure that the audio files are broken, because yesterday I replaced some of them, and after the replacing the game crashed. Unfortunately I can't find anywhere the original audio files.
Nah, it's not working. If I rename the mods folder, I won't have my mods if I play, but if I don't rename, it'll crash when loading LSPDFR.