Fallout 4 Script Extender (F4SE) vs Ultimate ASI Loader

Fallout 4 Script Extender (F4SE) is a free Windows resource for Fallout 4 modders who need expanded scripting capabilities. It extends scripting without changing the game’s executable files on disk. Listed interfaces include the Papyrus plugin API and hooks for Papyrus, Scaleform, and the classic script system. The homepage lists build 0.7.9 for Fallout 4 runtime 1.11.240. F4SE supports Fallout 4 releases from Steam and GOG, while MS Store, Game Pass, Epic, and other Windows Store versions are unsupported because those applications do not provide required APIs. Native code plugins require updates from their creators for runtime 1.10.980 and later, and plugins must have publicly available source code. Injection loads mods and may trigger poorly written virus scanners. Additional utilities include a command-line BA2 archive extractor and PEX script disassembler. The project is provided as-is and directs installation questions to its subreddit.

Ultimate ASI Loader is a free Windows proxy DLL that loads custom .asi libraries into a game process. It supports games using Win32 or Win64 libraries such as Direct3D, DirectInput, audio, and XInput. Installation usually means placing the DLL in the game directory as dinput8.dll, or renaming it to another supported DLL name. ASI files can be stored in the game root, scripts, plugins, or update folder. When needed, global.ini belongs in scripts or plugins, and the selected DLL name can also serve as the INI filename. The update folder can hold replacement game files while originals remain untouched; removing that folder reverses the change. The loader can forward many original DLLs after renaming them Hooked.dll, and d3d8to9 support is available when it is named d3d8.dll. Crash minidumps and logs are created when a CrashDumps folder exists beside the loader. Win32 and Win64 builds are available, including smaller NoPDB archives. The repository lists an MIT license.