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If you want extra antialiasing, it's possible to add FXAA through Nvidia Control Panel.
This only works with the game running in fullscreen mode.

Open Nvidia Control Panel
Click the "Manage 3D settings" section
Add "OC1.1.exe" (located in the Outcast 1.1 install directory) to a profile, set "Antialiasing - FXAA" to "On" and hit apply.
(result should look like this)

Comparison:
In-game AA
In-game AA + FXAA
Post edited December 19, 2014 by DreadMoth