I just installed Aoache and PHP 4.3 on windows 2k.
The apache server works fine and I changed the config file to incl;ude the lines
LoadModule php4_module c:\PHP\php4apache2.dll
AddType application/x-httpd-php .php .phtml .html
AddType application/x-httpd-php-source .phps
Note that the loadmodule path is correct, when its not correct I can't get apache to start, when it is correct it starts without error.
When I try to load a .php page in my brownser I get the standard windows dialog box that lets you choose the application to be used to edit the .php file.