return nil, osErrToFileErr(err)
	}

	w, err := OpenFile(filePath, mode, 0o666)
	if err != nil {
		// File path cannot be verified since one of the parents is a file.
		switch {
		case isSysErrIsDir(err):
			return nil, errIsNotRegular
		case osIsPermission(err):
			return nil, errFileAccessDenied
		case isSysErrNotDir(err):