self.file_index().expect("file metadata constructed based on directory listing instead of a file (see https://doc.rust-lang.org/std/os/windows/fs/trait.MetadataExt.html#tymethod.file_index)")
self.volume_serial_number().expect("file metadata constructed based on directory listing instead of a file (see https://doc.rust-lang.org/std/os/windows/fs/trait.MetadataExt.html#tymethod.volume_serial_number)")asu64