One problem with that ... (administrators enforcing policy, that is)
I've worked on a system where a file was composed of sub-files (Pr1mos). This was emulated on nix by using a directory with "special" names inside, namely all the subfiles were "<space><backspace><number>". Because nobody is supposed to touch these subfiles directly.
So if you enforce a policy like that, you could bust a bunch of apps ...