http://docs.racket-lang.org/reference/Filesystem.html#(def._((lib._racket/file..rkt)._file-~3estring)) (file->string path [#:mode mode-flag]) → string? path : path-string? mode-flag : (or/c 'binary 'text) = 'binary Reads all characters from path and returns them as a string. The mode-flag argument is the same as for open-input-file.