This is a DLL file which adds ASI plugin loading functionality to any game, which uses any of the following libraries:
It is possible(and sometimes necessary) to load the original dll by renaming it to <dllname>Hooked.dll, e.g. d3d12Hooked.dll.
With binkw32.dll and vorbisFile.dll it is optional and you can simply replace the dll. Always make a backup before replacing any files.
To install it, you just need to place DLL into the game directory. Usually, it works as dinput8.dll, but if it's not, there is a possibility to rename it(see the list of supported names above).
Put ASI files in the game root directory, 'scripts', 'plugins', or 'update' folder.