How about file system drivers? If there is such a thing any more... fuse and friends...

There is a port of FUSE for macOS, and Apple also has a first party API for this called FSKit…

I know there was a port of FUSE. But iirc it requires old style extensions. Has it changed?

	▲	dlachausse 2 days ago \| parent [-]
		Per the MacFUSE documentation… > macFUSE 5.0 supports multiple APIs for mounting file systems. > By default, macFUSE uses the VFS API to mount file systems. When specifying the mount-time option -o backend=fskit, macFUSE will use FSKit to mount the file system. https://github.com/macfuse/macfuse/wiki/FUSE-Backends