I have followed all the instructions in install.txt and readme.txt
Unzipped to c:\php
Renamed php.ini-dist to php.ini
Copied it to c:\windows
Copied php4ts.dll to c:\windows\system
Copied msvcrt.dll to c:\windows\system (though it was already there and in use, so I did it from DOS)
Modified the pws-php4isapi.reg file to point to php4isapi.dll (the path being c:\php\sapi\php4isapi.dll)
Enabled Execute in PWS for the dir that my hello.php file was in.
Browsed to it
And I get: One of the library files needed to run this application cannot be found.
???