question about mysqli

I am using PHP 5 on Windows. I have downloaded the lastest from snaps. When I try to use the mysqli functions, I get the error message: undefined function mysqli_connect() I assume this means that mysqli support is not compiled into the Windows version of PHP 5. However, there doesn't seem to be an extension dll for mysqli either in the extension directory. And no line for it in the php.ini file. Does anyone know about mysqli for Windows? Is it going to be compiled into PHP 5? Or an extension included? When might this happen? Or is there an extension available somewhere that I can get? Or is mysqli support available only if I compile the Windows version myself? Thanks, Janet