About This File
AMFIPass.kext is a replacement for amfi=0x80 boot argument.
When using amfi=0x80 boot argument some apps might crash or might not work properly in macOS Sonoma.
You also need to use -amfipassbeta boot argument for macOS Sonoma for now.
Update:
With AMFIPass.kext 1.4.0 and later, there's no need to use -amfipassbeta boot argument.