Executing registry subkeys
If you do not specify /d in string, Cmd.exe looks for the following registry subkeys:
HKEY_LOCAL_MACHINE\Software\Microsoft\Command Processor\AutoRun\REG_SZ
HKEY_CURRENT_USER\Software\Microsoft\Command Processor\AutoRun REG_EXPAND_SZ
If either one or both registry subkeys are present, they are executed before all other variables.
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.
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Enabling 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