PHP4 extensions on Windows platform

Hello everybody, I just started to switch from ASP to PHP4, so I am a bit green. Do you know from where can I download any extension dll for PHP4 Win version. I am interested about the IntreBase and MS SQLServer 7 dll. One of the subscribers of the list gave the http://download.swwwing.com/php4/modules/ site, but there is no InterBase dll, and he said the MS SQLServer 7 dll makes the PHP extremly insable. Where is the official extension site (if there is any), or who develops these dll-s? Thanks and best regards: Peter Baranyi