Does anyone have experience with php_ntuser/php_iisfuncs.dll?

I running php on a win2k/iis box in a intranet enviroment. I recently came across two dll's which I thought I might be able to use (in my windows enviroment): php_ntuser.dll and php_iisfuncs.dll. I found them on http://snaps.php.net/win32/PECL_UNSTABLE/ and http://kromann.info/pecl.php. Google returns 6 hits (three to snaps, three to kromann) so that was no help. ntuser is listed under the PECL unstable branch but the compile log(http://snaps.php.net/win32/PECL_STABLE/compile.log) shows no errors. So, does anyone now what is exposed by these dlls? or recommend a good decompiler? Thanks for the help. regards, mikeg