typedef std::string                           string_t;
typedef stlsoft::string_tokenizer < string_t
                                  , char
                                  , ...>      tokenizer_t;

// Tokenize the PATH contents, with ; as the separator
tokenizer_t tokens(winstl::environment_variable<char>("PATH"), ';');
HWND        hwndList = ::GetDlgItem(. . .);

// Iterate sequence, place each element in list control
tokenizer_t::const_iterator begin = tokens.begin();
tokenizer_t::const_iterator end   = tokens.end();

for(; begin != end; ++begin)
{
  // Add the item to the result ...
  const string_t  &s(*begin);

  ListBox_AddString(hwndList, s.c_str());
}