RED4ext

RED4ext is a script extender. It loads native plugins written in C++ into REDengine 4 and exposes engine internals that pure scripting cannot reach. The ArchiveXL, TweakXL, and Codeware stack and many advanced mods are RED4ext plugins.

Install it once and update it on patch days. Plugins live in red4ext/plugins inside the game directory, and the loader stays out of your way otherwise.