Freycinet, SweetFX is a 'shader suite' utility that applies post-processing visual effects to Cliffs Of Dover. One of the effects is a kind of anti-aliasing that your video-card doesn't use by default, and which never used to be available in your video card settings at all (hence the need for these kind of utilities). The SweetFX shader suite also enables you to change the colours of the game in a similar way to how you can change them in your video editing software when you're editing a recording of the game.
Attached to this post is a version of the SweetFX shader suite I've put together for Cliffs Of Dover. It applies anti-aliasing to some (not all) jagged edges and smooths them out. It also changes the default colours to something that might be considered more realistic looking (when flying during daylight hours).
Just copy the contents of the folder I've attached and paste them into wherever you have Cliffs Of Dover installed on your computer (wherever your Launcher .exe file is). To uninstall, just manually delete those same files. There's a readme included with further instructions in more detail (eg. you might want to back up your original 'd3d9.dll' file before over-writing it with the SweetFX one).
Here's a link to a (long and probably confusing) thread about it and another shader suite (injectFxaa_by_some_dude, that you can use instead of SweetFX), if you want to read up on it or see before and after pictures -
http://forum.1cpublishing.eu/showthread.php?t=32255