apache + php3 + php4 + extensions working simultaneously

Hi! I have installed apache 1.3.12 and php 4.0.3.pl1 on RH 6.2 I am new in the php world. How can I make a .php3 extension to be interpreted as a .php extension ? Do I have to modify apache conf, php conf or both ? I have made some test with the AddType directive, but they didn't work. I have taken a look to the php install file and I have followed the steps suggested below (***) (configure , make , make install ), but still the same result. If I add the commented line in httpd.conf file, apache issues a download window instead of executing the php3 script. <IfModule mod_php4.c> AddType application/x-httpd-php4 .php # AddType application/x-httpd-php4 .php3 AddType application/x-httpd-php .php </IfModule> (***) USING PHP 3 AND PHP 4 AS CONCURRENT APACHE MODULES Recent operating systems provide the ability to perform versioning and scoping. This features make it possible to let PHP 3 and PHP 4 run as concurrent modules in one Apache server. This feature is known to work on the following platforms: - Linux with recent binutils (binutils 2.9.1.0.25 tested) - Solaris 2.5 or better - FreeBSD (3.2, 4.0 tested) To enable it, configure PHP 3 and PHP 4 to use APXS (--with-apxs) and the necessary link extensions (--enable-versioning). Otherwise, all standard installations instructions apply. For example: $ ./configure \ --with-apxs=/apache/bin/apxs \ --enable-versioning \ --with-mysql \ --enable-track-vars Any help will be appreciated Thanks in advance Evelio