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Insane widescreen mod by Bayron aka Black_Lotus from InsaneHeat. This mod only works for 16:9 and 16:10 aspect ratios; all other widescreen/multi-monitor aspect ratios will still be skewed.
Install Game Patch 2 if using a retail version (digital versions are already patched) and extract the mod files into the installation folder. Run the batch file matching the aspect ratio you want and follow the prompts.