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  Substitution of batch parameters (%n) has been enhanced.  You can
  now use the following optional syntax:
      %~1         - expands %1 removing any surrounding quotes (")
      %~f1        - expands %1 to a fully qualified path name
      %~d1        - expands %1 to a drive letter only
      %~p1        - expands %1 to a path only
      %~n1        - expands %1 to a file name only
      %~x1        - expands %1 to a file extension only
      %~s1        - expanded path contains short names only
      %~a1        - expands %1 to file attributes
      %~t1        - expands %1 to date/time of file
      %~z1        - expands %1 to size of file
      %~$PATH:1   - searches the directories listed in the PATH
                     environment variable and expands %1 to the fully
                     qualified name of the first one found.  If the
                     environment variable name is not defined or the
                     file is not found by the search, then this
                     modifier expands to the empty string
  The modifiers can be combined to get compound results:
      %~dp1       - expands %1 to a drive letter and path only
      %~nx1       - expands %1 to a file name and extension only
      %~dp$PATH:1 - searches the directories listed in the PATH
                     environment variable for %1 and expands to the
                     drive letter and path of the first one found.
      %~ftza1     - expands %1 to a DIR like output line
  In the above examples %1 and PATH can be replaced by other
  valid values.  The %~ syntax is terminated by a valid argument
  number.  The %~ modifiers may not be used with %*
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More detail: call/?&for/?