Je pense qu'il faut invoquer l'aide bienveillante de WinHelp (je dis ça mais pas encore testé).
The WinHelp function starts Windows Help (WINHELP.EXE) and passes additional data indicating the nature of the help requested by the application. The application specifies the name and, where required, the directory path of the help file to display.
BOOL WinHelp(
HWND hWndMain, // handle of window requesting Help
LPCTSTR lpszHelp, // address of directory-path string
UINT uCommand, // type of Help
DWORD dwData // additional data
);