(do_auto_save_unwind): Set auto_saving to 0.
(Fdo_auto_save): Don't clear auto_saving here. Set it to 1 only when we make the unwind-protect. (Ffile_modes) [DOS_NT]: Use check_executable. (check_executable): DOS_NT code moved here from Ffile_modes. (check_writable): New code for MSDOS. (Fexpand_file_name): Initial ~ means name is absolute.
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