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F4SE (Fallout 4 Script Extender) is a modding tool that extends the scripting capabilities of Fallout 4, allowing mod authors to add new features and functionality. It is developed by Ian Patterson, Stephen Abel, and Brendan Borthwick, and supports the latest Steam and GOG versions of the game.
AI named Fallout Script Extender (F4SE) from December 2025 to January 2026.