migrating from php3 to 4

Hello ! :)) This should be a pretty common question, but I couldn't find a FAQ ;) I've been trying to migrate from PHP3 to the New PHP4b2 under NT, I downloaded the win32 distribution... and followed the instructions, but It might be something I failed to do... Could anyone explain in detail?.. (and what about the extension dlls, I renamed those from php3_xxx.dll to phph_xxx.dll, is this correct or is there a zip file with a new version of the extensimons as well?) .. the response from the webserver is cannot read configuration file (of course php.ini is available), but I think there is something to do in order to recognize the .php extension THANKS A LOT :))) Cheers from Mexico Enrique Motilla