Force the game to run in a specific non-widescreen resolution?

[unidenti7ied]

This is my very first post here on steam (I think O.o), usually I find an answer for my game-related problems here at the community hub and just leave a like :)
So I hope someone could help me out with the following?
I just bought the game and really want to play it (launches just fine via steam-play and the newest version of proton), but it seems that there is no option -or at least none that I am aware of- to change the, well, resolution to a non-widescreen format. In my case that would be 1280x1024 (at 60Hz).

I tried to set parameters in the launch options (-width-1280 -height-1024) but no changes applied, the game is 'stuck' at 1280x720. I can set a lower resolution though, but as I mentioned before these are only widescreen-format ones.

And to answer the following question in advance: yes, I am playing on a 5:4 fujitsu ips-monitor which max. resolution is 1280x1024 (at 60Hz).

Help is much appreciated :)

[c4_deathstreak]

I'm about to buy this game, and I'm a CRT gamer. I'll let you know how things pan out for me.

[c4_deathstreak]

So, my experience was pretty straightforward: My CRT's resolution by default is at 800x600@160Hz, and the game automatically started in that, so I did not even have to make any adjustments. The only thing I had to do was adjust vsync settings via the NVIDIA Control Panel (since I am on one of their cards). Basically, I had no issues with resolution whatsoever. Hopefully you have been able to overcome your issues since initially posting.

[unidenti7ied]

Well, thanks for the kind reply, I really appreciate that :)

Turns out, when I 'reset' the game (validate integrity of game files), there is a new option to run the game in 1024x768x60 at the in-game options menu. Very strange..
So my guess is, that maybe I have to find a config-file in one of the game sub-folders within the steamapps/common data folder (.ini or .cfg I guess).

I am on one of Nvidias cards (GTX 950) also, since their proprietary drivers are much more advanced under GNU/Linux, I think. The option(s) to force Vsync ON is always activated on my system by default.

p.s.:
I've never encountered a real CRT-Gamer in, well, modern internet-times, nice to meet you ;)

I'll post a message for the "widescreen-problem' in here, as soon as I've managed to find a solution.

EDIT: I've found this article which mentions some configuration files:
https://www.pcgamingwiki.com/wiki/Project_Warlock

So far I figured out that it has something to do with the unity-specific .reg files but I m not able to find Screen Resolution parameters there..