You can also just use DgVoodoo2.

1. Extract into your BG folder, and then move the files out of MS/x86 up into the game folder as well.
2. Launch dgVoodooCpl.exe
3. Right click on the tabs and click "Show all sections of the configuration".
4. On the tab "GeneralExt", choose your Integer scale factor. I've got a 2560x1440 monitor, so I choose 4.
5. Launch the game in all its crisp, low-res glory.

You can also just use the "Resolution" box in the DirectX tab to scale the game, but I get green sprites that I can't disable even with the in-game options. The integer scaler looks perfect.

Already tried DgVoodoo2 and it will not work no matter what settings I use.

I mean, that it will not work at all. Like it doesn't even register the game. And yes I have moved those DLL's that are brought up into the game folder and nothing. Launching the game simply distorts the screen to that lower resolution like usual.
As for system, I am on windows 10 and I have used DgVoodoo2 successfully before. It just for whatever reason refuses to work with BG2.

LMAO

I have tried various DirectDraw wrappers with the Infinity Engine games - including dgVoodoo - and have found that cnc-ddraw offers the best balance of performance, simplicty and flexibility. It easily allows for upscaling to be performed in a pixel-perfect fashion while correctly preserving the aspect ratio, irrespective of the native screen resolution. Alternatively, it allows for upscaling to be performed with the aid of loadable pixel shaders, which can be surprisingly effective - even if forgoing the option to upscale by an integer factor. In retrospect, I probably should have posted in this thread. In any case, please refer to my recent post in the "A Conservative Modder's Guide to Baldur's Gate 1" thread. There, I explain how to use the cnc-ddraw wrapper in some detail.