Consider the following VO function:

function RegistryDWord( hKey as ptr, cSubKey as string, cValueName as string ) as int pascal
local ptrKey as ptr
local nData as int
local nResult as long
local nLen as dword

nResult := RegOpenKeyEx( hKey, String2Psz( cSubKey ), 0, KEY_QUERY_VALUE, @ptrKey )
if nResult == ERROR_SUCCESS  
  nLen := 4
  nResult := RegQueryValueEx( ptrKey, String2Psz( cValueName ), null_ptr, null_ptr, @nData, @nLen )
  if nResult != ERROR_SUCCESS
    nData := -1 
  endif
  RegCloseKey( ptrKey )
endif

return nData

In X# it can be changed to

function RegistryDWord( hKey as ptr, cSubKey as string, cValueName as string ) as int pascal
local nData as int

if ! Left( cSubKey, 1 ) == "\"
  cSubKey			:= "\" + cSubKey
endif 
do case
case hKey == HKEY_CLASSES_ROOT
  cSubKey := "HKEY_CLASSES_ROOT" + cSubKey
case hKey == HKEY_CURRENT_USER
  cSubKey := "HKEY_CURRENT_USER" + cSubKey
case hKey == HKEY_LOCAL_MACHINE
  cSubKey := "HKEY_LOCAL_MACHINE" + cSubKey
case hKey == HKEY_USERS
  cSubKey := "HKEY_USERS" + cSubKey
endcase  
nData := ( int ) GetRegistryValue( cSubKey, cValueName, 0 )
return nData