No, OsStr is for OSes that don't encode strings as UTF-8, e.g. Windows by default. Use Path or PathBuf for paths, they're not strings. Pretty much every OS has either some valid strings that aren't valid paths (e.g. the filename `CON` on Windows is a valid string but not valid in a path), some valid paths that aren't valid strings (e.g. UNIX allows any byte other than 0x00 in paths, and any byte other than 0x00 or `/` in filenames, with no restrictions to any text encoding), or both.