We recently tried installing PHP 4.06 on a server using the directions at beniot.noss.free.fr/php/install-php4.html. The first part went fine, we were able to run a test script on the NT Box. After the 2nd step, Configuring Netscape Enterprise Server, the server refused to start up until we rotated back to the original obj.conf file. The error was that httpd wouldn't start, "VisualBasic C++" was mentioned.
We narrowed it down to the line:
Init fn="load-modules" funcs="php4_init,php4_close,php4_execute,php4_auth_trans" shlib="c:/php4/sapi/php4nsapi.dll"
Up until adding this line, the server will start up just fine.