Uh, this is exactly the type of thing that FUSE is good for. Doing this as a FUSE layer would be way way easier than for Windows (unless they used Dokany[1], an

Uh, this is exactly the type of thing that FUSE is good for. Doing this as a FUSE layer would be way way easier than for Windows (unless they used Dokany[1], and they probably didn't) or god knows what you have to do to get OS X to support user-space filesystems. 1. https://github.com/dokan-dev/dokany https://github.com/dokan-dev/dokany