im convert php-screw to windows dll

Hi.. I'm trying to get PHP Screw working on Windows thru Visual C++ compiling it as a windows DLL, everything works except it doesn't actually replace the fopen function, it seems to ignore that command. I would really like to get this working, I have a project that you can look at if you are interested: http://koula.co.za/screwdll.zip I am creating files in c:/ to check if a function runs, and only the pm9screw_open doesn't run, when replacing zend_open with it Thanks if you can help Regards Andrew