/** @file dk3ufi.h Unique file identifiers. The dk3ufi_get_app() and dk3ufi_get() functions obtain a unique file identifier (UFI) for a named file. The file must be a regular file. If the UFIs for two file names are equal both file names refer to the same file (the same inode), i.e. "x.txt" and "./x.txt". If UFIs differ, the file names point to different files. */