Nobody else really uses them to the extent Apple does, but this sort of thing isn't unique to HFS+. https://en.wikipedia.org/wiki/Extended_file_attributes http

Nobody else really uses them to the extent Apple does, but this sort of thing isn't unique to HFS+. https://en.wikipedia.org/wiki/Extended_file_attributes https://en.wikipedia.org/wiki/Extended_file_attributes You can do the exact same thing on Windows (on an NTFS volume), just go to a command prompt and run "notepad hello.txt:secret" and see how DIR and Windows Explorer deal with it.