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1,751 downloadsAGEIA PhysX v2.5.2 DLLs needed for some old games (e.g. Infernal) due to not being included in the newer NVIDIA PhysX installers. Install the regular NVIDIA PhysX System Software and NVIDIA PhysX Legacy System Software (linked on the same page), then extract this folder to the Engine folder where PhysX is installed. These files were extracted from NVIDIA PhysX System Software 8.09.04 WHQL.