How to use http authentication of PHPMyAdmin under IIS5.0??

[nuying117]

in this environment of [win2000server + iis5.0+php4.3.3],I couldnot use the PHPMyAdmin's http authentication ,but the online documentitions in php.net says,

"If you don't want to perform HTTP Authentication using PHP, you can (and should) skip this step. Under ISAPI Filters, add a new ISAPI filter. Use PHP as the filter name, and supply a path to the php4isapi.dll. "

I do what it tell us to do,but no effect!

but when i do that in [win2000server+apache2.0.47+php4.3.3] ,i succeeded!

but why ??doesnot iis support http authentication??

thanks for feed back and thanks for ur time!