Reading PHP.INI not from C:\WINNT

Hi! I can't make php.exe to read the configuration file, php.ini, from another path different from c:\winnt\. This location seems to be the default, but I want to change it to any other. I tried erasing php.ini from C:\winnt\ and I thought php.exe would read the php.ini siting next to it (in the same directory), but it didn't. It sees php.exe just doesn't read ANY php.ini if it does not find it in c:\winnt\. This problem is important for me because I want to work with different configuration files for each of my sites. Any clue? Thanks a lot. Cheers. Diego.