Wishmaster777: Since both games use the same engine, this instruction works for both games .

Find the installation folder. Enter Scripts sub-folder. Find PersistentSymbols file. Open it.
Once the notepad file has been launched use the search function to locate these lines:
persistent extern user FLOAT plr_fFOV=(FLOAT)xx;

Change its default value into:
persistent extern user FLOAT plr_fFOV=(FLOAT)105; for 16:9 screen resoultion.
persistent extern user FLOAT plr_fFOV=(FLOAT)100; for 16:10 screen resolution.

Find these next:
persistent extern INDEX sam_iScreenSizeI=(INDEX)xxxx;
persistent extern INDEX sam_iScreenSizeJ=(INDEX)xxxx;

Change its value for desired screen resolution. Upper value is width, lower value is height:
persistent extern INDEX sam_iScreenSizeI=(INDEX)1920;
persistent extern INDEX sam_iScreenSizeJ=(INDEX)1080;

Enjoy the game with a modern resolution standard.

goofyseeker3: so, dont enable the widescreen option at all.
just edit the screensize and fov parameters in the persistentsymbols file.
now 4K works just fine.