/* The NT cmd.exe shell has the following peculiarity that needs to be
       * worked around.  It strips a leading and trailing dquote when any
       * of the following is true:
       *    1. the /S switch was used
       *    2. there are more than two dquotes
       *    3. there is a special character from this set: &<>()@^|

       *    4. no whitespace characters within the two dquotes
       *    5. string between two dquotes isn't an executable file
       * To work around this, we always add a leading and trailing dquote
       * to the string, if the first argument is either "cmd.exe" or "cmd",
       * and there were at least two or more arguments passed to cmd.exe
       * (not including switches).
       * XXX the above rules (from "cmd /?") don't seem to be applied
       * always, making for the convolutions below :-(
       */