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.

In a batch file, the SETLOCAL ENABLEEXTENSIONS or DISABLEEXTENSIONS arguments
takes precedence over the /E:ON or /E:OFF switch. See SETLOCAL /? for details.

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.

COM+ Services was unable to load a required string resource. The string resource identifier was not found. This results from ... COM+ Services was unable to obtain local SAM information. COM+ will continue to operate normally, but any calls between local ... COM+ Services was unable to process a component's call to IsCallerInRole due to an unexpected failure. The unexpected error ... COM+ was unable to set up the ODBC shared environment, which means that automatic transaction enlistment will not work.%1%0 ... Command Extensions are enabled by default. You may also disable extensions for a particular invocation by using the /E:OFF ... Command line options: /Q - Quiet modes for package, /T: - Specifies temporary working folder, /C - Extract files only to ... Command' is mutually exclusive with 'CommandName'. Either specify 'CommandName' (optionally with 'Parameters'), or 'Command'. ... Commands available are: NET ACCOUNTS NET HELPMSG NET STATISTICS NET COMPUTER NET LOCALGROUP NET STOP NET CONFIG NET PAUSE ... Commands Supported - 8dot3name 8dot3name management behavior Control file system behavior dirty Manage volume dirty bit file ...