Here is a tip to remove a substring via batch command     For example:     If I'd like to remove file extension name      from  Install .wim   to  Install       We can try below command:      Test.cmd    SET WINPE=%1   echo %WINPE%   SET WINPE=%WINPE:.wim=%   echo %WINPE%          Input:     Test.cmd Install.wim          Output:     Install       REF:    http://www.dostips.com/DtTipsStringManipulation.php