[skissane]

Yes, that’s not what I’m talking about though

MacFUSE uses the kernel mode VFS API

I’m talking about the undocumented user mode filesystem LiveFS/UserFS/com.apple.filesystems.lifs API which was added in Monterey (macOS 12), and since Ventura (macOS 13) is used to implement the OOTB FAT and exFAT filesystem support. Using that requires private entitlements (e.g. com.apple.private.LiveFS.connection) which Apple (thus far) won’t give to anyone else

[ranger_danger]

What about the File Provider API?

[skissane]

It is designed for the cloud storage use case (Dropbox, Google Drive, etc) - it creates local copies of files and synchs them with remote ones. Not what you want to do in the general case.

[skissane]

I take it from the downvotes people think what I said is factually wrong?

If that's the case, I wish someone would point out where I've got it wrong instead of just silently downvoting