Are you guys having the same problem? My laptop is running windows 7 SP 1 64-bit, and nVIDIA GeForce 310M, widescreen monitor. But when i change the setting to Direct 3D 4x anti-aliasing filter, it gave me warning, the ss are in attachment. Help me guys! im dying to play this game in perfect display environment, widescreen and covering the entire monitor. thanks!

Had the same problem, with no solution.

Me too, do you by any chance know how to fix it?

Is your laptop monitor capable of displaying a resolution of 1280x800? What is the resolution of your desktop?

Ok, so I think you are misunderstanding the meaning of the game's settings here.

The default resolution in which the game was created is 320x200, and the available Direct3D options for the graphics basically scale that original resolution to 2x / 200% (640x400), 3x / 300% (960x600) or 4x / 400% (1280x800) with or without anti-aliasing, which is used to smoothen (= blur) the edges of the pixel graphics, should you prefer that.

In terms of aspect ratio, these are all 16:10 resolutions, so unless that is the aspect ratio of your laptop's screen (and in my experience most modern laptop screens use 16:9), there is no way to have the game "cover the entire monitor" through these settings. There might be ways to achieve this through your video card driver's scaling settings, but this will result in the game being "stretched" to fit your monitor's aspect ratio.

Now, in my opinion, to make the game look its best (ie. make the graphics look sharp and crisp) and have it fill the largest possible area of your screen, you'll first need to figure out -- as doady said -- if your laptop is capable of displaying a resolution of 1280x800. If it is, go with the 4x nearest-neighbor filter. If not, choose the 3x nearest-neighbor filter (960x600). This will result in the game covering most of your screen, with a black border around it, and in the correct aspect ratio / without stretching. This way it looks great and is perfectly playable.

In addition, you can turn off the "Smooth scaled sprites" option which blurs the edges of the character sprites when they are scaled -- for example, when a character is walking down a street in a northern direction and is scaled to look smaller and smaller the further they move away from you -- in my opinion the blurryness of the sprites looked "off" compared to the crisp pixels of the environment in these kind of situations. It all comes down to personal preference though... Once you find the resolution that works, you can play with the options a bit. I personally prefer games in this graphics style to look like the attached screenshot.

Thank You! I've been messing with the .cfg and winsetup.exe for half an hour. I can't believe I missed this option...

I know this post is more than six years old by now, but I found a solution that works for me. Maybe it also works for others who come here with the same problem, as I did a couple of hours ago.

Anyway, go to the game's installation folder, right-click the executable (Gemini Rue.exe), go to the Compatability tab, check the box next to "Reduced Color Mode", and select "16-bit (65536) color" (see attachment/screenshot).

The game now runs in fullscreen on my 1920x1080 display, and it has small borders to the left and right. This is normal, though, since the game runs in 16:10 resolution on a 16:9 display while preserving the proper aspect ratio.

I've tried this approach as I have Windows 10 too, but the game still refuses to launch. I really don't know what to do... :(

After some more attempts and opening a support ticket, I've found out a configuration that works at least for me. This is all in the "Graphics settings" section. Unmentioned options are left unticked.

Graphics driver: Direct3D 9
Graphics filter: none
Side borders on widescreen monitors: yes
Smooth scaled sprites (fast CPUs only): yes
Force alternate letterbox resolution: yes

For reference, I'm running Windows 10 x64 1803, and my graphics card is a Radeon RX 580 with the latest available drivers. I didn't have to set compatibility mode to any executable program related to the game.