The only problem is that you have to delete the "autoexec.cfg" file, before you start playing.
To confuse some people is a way that also might help
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To execute these commands, you either put them in system.cfg ( if existent), By enabling the console (the “~” key) or
you put them on the command line (right click on the exe and then properties).
#Note: IF YOU PUT THESE CONFIGS INTO SYSTEM.CFG, YOU WON'T NEED THE "+" BEHIND, ONLY THE COMMAND, FOR EXAMPLE sys_spec_shading=3
1 = Enabled; 0 = Disabled; x = Enter the desired value; 1/2/3 = 1 is smallest setting and 3 is highest
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sys_spec_gameeffects = 1/2/3 -> Changes Game Effects such as body-related stuff like when they disappear
sys_spec_objectdetail = 1/2/3 -> Changes the quality of the detail of the objects
sys_spec_particles = 1/2/3 -> Changes the quality of the particles
sys_spec_physics = 1/2/3 -> Changes how you interact with the world ( higher is more CPU-intensive )
sys_spec_postprocessing = 1/2/3 -> Changes the quality and amount of post processing used
sys_spec_shading = 1/2/3 -> Changes the quality of the shaders
sys_spec_shadows = 1/2/3 -> Changes the quality of the shadows
sys_spec_sound = 1/2/3 -> Changes the quality if the sound
sys_spec_texture = 1/2/3 -> Changes the quality of textures
sys_spec_water = 1/2/3 -> Changes the quality of the water
+cl_crouchToggle=0/1 -> Disables/Enables crouch toggle
+cl_zoomToggle=0/1 -> Disables/Enables Zoom toggle
+i_mouse_accel=0 /1 -> Disables/Enables mouse acceleration
+g_skipIntro=0/1 -> Disables/Enables Intro Skipping
+cl_fov=x -> Enter your desired value for the Field of View
+r_DrawNearFoV=x -> Enter your desired value for the Field of View of nearby objects
+pl_movement.power_sprint_targetFov=x -> Enter your desired value for the Field of View while sprinting
+r_motionblur=0/1 -> Disables/Enables Motion Blur
+g_radialBlur=0/1 -> Disables/Enables the Radial Blur, which gives you the effect of speed
+r_Flares=0/1 -> Disables/Enables Flare effects around certain dynamic lights
+r_Glow=0/1 -> Disables/Enables Bloom effects
+r_HDRRendering=0/1 -> Disables/Enables HDR Rendering
+r_SSAO=0/1 -> Disables/Enables Screen Space Ambient Occlusion
+q_ShaderHDR=0/1 -> Disables/Enables Shader HDR effects
+r_ColorGrading=0/1 -> Disables/Enables Color Grading
+r_MultiGPU=0/1 -> Disables/Enables SLI/CrossFireX (requires next patch)
+r_MultiThreaded=0/1 -> Disables/Enables Multi-thread support
+g_useHitSoundFeedback=0/1 -> Disables/Enables Sound feedback of a hit
+e_shadows=0/1 -> Disables/Enables shadows
+r_FSAA=0/1 -> Disables/Enables Full-scene Anti-Aliasing
+r_UseEdgeAA=0/1 -> Disables/Enables Edge Anti-Aliasing
+r_TexMaxAnisotropy=1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16 -> Select the desired value for Anisotropic Filtering ( from 1x to 16x )
+d3d9_TextureFilter=bilinear/trilinear -> Chooses between bilinear and trilinear texture filtering
+cl_sensitivity=x -> Enter your desired value for mouse sensivity
Have fun!