JSI Tip 0493 - Windows NT Command Extensions.

Command Extension are automatically enabled in Windows NT. You can alter this behavior of the command enterpreter with the following switches:

CMD /y      Disable extensions to the Windows NT version of CMD.EXE
CMD /x      Enable extensions to the Windows NT version of CMD.EXE

You may also edit:

HKEY_CURRENT_USERSoftwareMicrosoftCommand ProcessorEnableExtensions

Setting this REG_DWORD value to 0 disables Command Extensions for all CMD.EXE sessions (a 1 enables them).

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 the details, type HELP .