The file you need to edit is located here:

C:\Users\YOURUSERNAME\AppData\Local\Sidhe\SH

And it is called:

application_parameters.xml

You can edit the file with a program such as Notepad++. You simply need to change the 1920x1080 resolution you see to your desired resolution, e.g. 3840x2160 for a 4K screen. I have no idea if ultrawide resolutions work, my guess would be not, though 16:10 appears to be supported since 1920x1200 is a default resolution option.



That should get you running at native 4K. Note that it doesn't actually look *that* much better because the game has pretty clean lines as it is and good anti-aliasing. But why settle for less?