The GOG.com version of I.G.I.-1 includes some community patches, but still suffers from modern GPU issues. DgVoodoo works perfectly with it. Just copy the DLLs as described. The GOG version already places the game outside Program Files , which is helpful.
You do not need to install the entire package into your game folder. You only need specific files: Open the downloaded ZIP file.
Download the latest stable version of the wrapper from the official developer site or repository: Official Website: Dege's stuffs GitHub Releases: dege-diosg/dgVoodoo2 (Latest version: dgVoodoo2_87_1.zip as of April 2026) 2. Installation Steps dgVoodoo 2 - Dege's stuffs
Click on the DirectX tab. Here, you can customize the rendering.
: Check this box to significantly improve FPS and fix lag. 4. Compatibility Extras
Set to Fullscreen or "Fullscreen (stretched)" for widescreen support. Ensure Graphics Library Wrapper is set correctly. DirectX Tab:
If you'd like, I can help you find a community-made patch that fixes the in-game HUD stretching, making your widescreen experience perfect.
However, 20+ years later, running I.G.I.-1 on Windows 10 or Windows 11 is a nightmare. Common issues include:
In your Project I.G.I. folder, right-click dgVoodooCpl.exe and select .
Ensure "Output API" is set to Direct3D 11 (Feature Level 11.0) . DirectX Tab: Videocard: Select dgVoodoo Virtual 3D Accelerator . VRAM: Set this to 2048MB or higher.