It's the tut for Skyrim which uses more fancy stuff than Freelancer can, so in FL term it'd be the d3d8.dll and the enbseries.ini (the latter only being a config file).
If you want to disable it temporarily ingame, use shift+F12. If it's just too bright for you (it is for some systems), use Shift+F9 to inverse bloom. I always use Inverse Bloom, looks "sharper" and more detailed in my opinion. But yes, the whole thing is up to taste, as usual.