Example:
reg add "HKCU\Software\Classes\CLSID\86ca1aa0-34aa-4e8b-a509-50c905bae2a2\InprocServer32" /ve /t REG_EXPAND_SZ /d "%SystemRoot%\System32\example.dll" /f
: This is the base command for adding a new registry value. The "reg" command is used for interacting with the Windows Registry, and "add" specifies that a new value is to be added.