In /usr/bin/mxtar line 24:
mcopy $dosfile - | tar $taropt - "$@"
      ^------^ SC2086: Double quote to prevent globbing and word splitting.
                       ^-----^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
mcopy "$dosfile" - | tar "$taropt" - "$@"

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...