http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/cmd.mspx?mfr=trueEnabling and disabling command extensions
Command extensions are enabled by default in Windows XP. You can disable them for a particular process by using /e:off. You can enable or disable extensions for all cmd command-line options on a computer or user session by setting the following REG_DWORD values:
HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\EnableExtensions\REG_DWORD
HKEY_CURRENT_USER\Software\Microsoft\Command Processor\EnableExtensions\REG_DWORD
Set the REG_DWORD value to either 0×1 (that is, enabled) or 0×0 (that is, disabled) in the registry by using Regedit.exe. User-specified settings take precedence over computer settings, and command-line options take precedence over registry settings.
Caution
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Incorrectly editing the registry may severely damage your system. Before making changes to the registry, you should back up any valued data on the computer.
When you enable command extensions, the following commands are affected:
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assoc
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call
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chdir (cd)
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color
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del (erase)
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endlocal
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for
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ftype
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goto
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if
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mkdir (md)
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popd
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prompt
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pushd
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set
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setlocal
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shift
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start (also includes changes to external command processes)
For more information about these commands, see Related Topics.
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