I already have the same problem, i think is a problem of versions. Check find the "Penumbra collection" who the bottle trick works. En francais parce que je suis pas super fort en anglais : J'ai eu le même probleme avec ma version de Black Plague. J'ai telecharge le jeu "Penumbra Collection" ou la, le trick de la bouteille fonctionne étonnement

Ok i finally fond If was not search in the files of the games but in the "Document" folder on your PC.

C:\Users/you/\Documents\Penumbra\Black Plague

Hello, i use the GOG version et i can't put my game in windowed mode and use the quicksave like all the tutorial say. I can't find the settings.cfg file but i just find the defalt-settings.cfg file. This file is the same than the famous settings.cfg so i put AllowQuickSave in "true" and FullScreen in "false" but nothing happens. I discover than default_settings.cfg was useless becase when i delete this file, the game work still fine.

I search everywere in the files of the game another file config but i not fond anything.

Thank's a lot !