1. Make a fresh install of Ground Control Anthology.

2. Download Ground Control Resolution Changer 2.1:
https://drive.google.com/file/d/1E58QoPPcNv9O-wEJl9sE-uB6JOTAYgYf/view

3. Unpack .zip and copy gc-resolution-changer.exe to the game's folder
...\Steam\steamapps\common\Ground Control Anthology

4. Run gc-resolution-changer.exe and set up desired resolution (i.e. 1920x1200).

5. Launch the game (through steam or gc.exe) and go in the main menu to video settings and change the resolution to 800x600, apply and quit the game.

6. Launch the game again, this time your desired resolution should be set!

1. Follow previous instructions, but set as follows:
For 16:9 monitors: 1024x576
For 16:10/8:5 monitors: 1024x640
For 21:9 monitors: 1024x432

2. Download dgVoodoo2:
http://dege.freeweb.hu/dgVoodoo2/bin/dgVoodoo2_75_1.zip

3. Extract dgVoodoo2 to desired location.
4. Copy D3Dlmm.dll and DDraw.dll from .../dgVoodoo2_75_1.zip/MS/x86 to the game folder.
5. Navigate to the folder your extracted dgVoodooSetup.exe to, then run dgVoodooSetup.exe.
6. Click "Add" and navigate to the game's folder, then click "Select Folder".
7. Click on the DirectX tab.
10. Under Resolution, select your monitor's native 4K resolution from the dropdown list.
11. Click "Apply" then "OK".
12. Run the game

If you experience crash at startup on Windows 10 you may want to install the crash fix:
https://www.moddb.com/mods/ground-control-windows-10-crash-fix/downloads/patch25
Original thread for the fix: https://psteamcommunity.yuanyoumao.com/app/254820/discussions/0/3004430047201705310/

Note that I did not try this fix as I had no such issues on my W10.