### Operating System - [ ] Windows - [ ] macOS - [ ] Linux - [ ] FreeBSD - [ ] OpenBSD - [ ] Android - [ ] iOS - [ ] Nintendo Switch - [ ] PlayStation 5 - [ ] Xbox - [ ] Web Browsers ### What feature would you like to be added? As the file system implements `ReadDirFS` (#3084), `ReadFileFS` should be implemented for consistency ### Why is this needed? Just for consistency.