C / C++ / MFC

DWORD dwVersion = GetVersion();

if ( dwVersion < 0x80000000)
{
            // OS is NT/2000/XP
    HANDLE hToken;
    LUID tmpLuid;

    HANDLE handleProcess=GetCurrentProcess();

    if (!OpenProcessToken(handleProcess,TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
        return;

    if (!LookupPrivilegeValue(0,"SeShutdownPrivilege", &tmpLuid))
        return;

    TOKEN_PRIVILEGES NewState;
    LUID_AND_ATTRIBUTES luidattr;

    NewState.PrivilegeCount = 1;
    luidattr.Luid=tmpLuid;
    luidattr.Attributes=SE_PRIVILEGE_ENABLED;
    NewState.Privileges[0]=luidattr;

    if (!AdjustTokenPrivileges(hToken, false, &NewState, sizeof(TOKEN_PRIVILEGES), 0, 0))
        return;
}
ExitWindowsEx(...);