LibXML support in Win32 PHP4?

I've been reading the book "Web Application Development with PHP 4.0", by Tobias Ratschiller and Till Gerken (New Riders, ISBN: 0-7357-0997-1). On page 264, it talks about LibXML integration saying, "Since version 4.0 [of PHP], a new XML parser is built into PHP: LibXML". Now, I have downloaded the Win32 version of PHP 4.0.2 and run php_info(), which tells me that XML is included - though no indication of what XML. I have successfully run some of the Expat-based examples. I have also coded some of the examples that use LibXML only to suspect that it is not part of this platform distribution. Am I correct in this conclusion? The platform for which I'm developing is strictly Win32. I don't have the option of LINUX. Am I out of luck with LibXML in PHP 4 for Win32 or am I missing something here? I really want to use LibXML with PHP 4 under Windows NT 4. Can anyone tell me how I can make this happen? Cheers, S t u a r t .