http://pcgamingwiki.com/wiki/Geometry_Wars_3:_Dimensions_Evolved#Anti-aliasing_.28AA.29
There's no "AntiAliasing" in 'Settings' file, full content:
{
"WindowMode": 1, "ResolutionWidth": 1920, "ResolutionHeight": 1080, "RefreshRate": 60, "DetailSettings": 4, "TripleBuffering": false, "VoiceEnabled": true, "JoystickInputMappings": []
}