Command Extensions are enabled by default. You may also disable extensions for a particular invocation by using the /E:OFF ...

Command Extensions are enabled by default.  You may also disable  extensions for a particular invocation by using the /E:OFF switch.  You  can enable or disable extensions for all invocations of CMD.EXE on a  machine and/or user logon session by setting either or both of the  following REG_DWORD values in the registry using REGEDIT.EXE:        HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\EnableExtensions            and/or        HKEY_CURRENT_USER\Software\Microsoft\Command Processor\EnableExtensions    to either 0x1 or 0x0.  The user specific setting takes precedence over  the machine setting.  The command line switches take precedence over the  registry settings.    The command extensions involve changes and/or additions to the following  commands:        DEL or ERASE      COLOR      CD or CHDIR      MD or MKDIR      PROMPT      PUSHD      POPD      SET      SETLOCAL      ENDLOCAL      IF      FOR      CALL      SHIFT      GOTO      START (also includes changes to external command invocation)      ASSOC      FTYPE    To get specific details, type commandname /? to view the specifics.
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