I don't know any manual, but I vaguely remember that RCDATA is a kind of data on .rc files which can accept arbitrary data With the correct parameters on google you can search for example .rc files which use RCDATA http://www.google.com/codesearch?hl=en&lr=&q=rcdata+file%3A%5C.%28rc%29%24&btnG=Search -- Felipe Monteiro de Carvalho