Have you checked NVidia control panel? It should have some method to select executable names that enable 3D mode. WinUAE uses Direct3D by default which probably triggers 3D mode by default. (Uselessly but display driver can't know if program is "real" 3D or not..)
You can switch to DirectDraw (misc panel) but it is legacy API and not supported by all features.
Log crash fixed. (It was not specifically 64-bit only issue)
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