Force a video resolution / aspect ratio?

[Yuhaney]

I used to do this with Penumbra Tech Demo, since game crashed everytime I tried to change any of the settings, so I had to do the resolution change manually.

I don't have Amnesia installed so I cannot check what is the file called but I think you find it out by reading this:
Go to the folder where ever you installed Amnesia and open up "settings" file (if it's called that, it's that on Penumbra's case) into your notebook, and search the resolution part and then just insert what ever resolution you want and save the file.