You can try disabling option DirectX\DisableAltEnterToToggleScreenMode. In that case, dgVoodoo does not put the DX device into lost state and does not minimize the window so the game might survive. But, if the game looks for losing the focus and "get confused", then it unfortunately won't help. …

I tried Command & Conquer: Generals with dgVoodoo, and it's generally alright, but the game doesn't survive alt-tabbing and crashes to desktop. There are a couple of points I have to mention about running this game without dgVoodoo: 1-By opening the game, it crashes after alt-tabbing once. 2-By …