Use php script on HS

Hi, I need to integrate a small application written in php into the HomeSite in order to use it without leave HS' interface ... I've tryed to add a Custom toolbutton setting "launch an external application" with a filename like this: C:\my_programm\php\php.exe -q the_script.php But when I try to use this new button, HS take an error: file not found ... (Note: the filename path is correct and works properly in MS DOS command line) Anyone could help me please? max