ISAPI Filters

From: patrick (patl_at_reply.newsgroup.msn.com)
Date: 07/07/04 

Date: Wed, 7 Jul 2004 17:36:15 +0100

Environment: IIS5.1 on Windows XP Professional SP1

I have just installed Active Perl 5.8.4
http://www.activeperl.com/Products/Download/Download.plex?id=ActivePerl on
the computer, which by default created an ISAPI filter for *.pl (executable
=c:\perl\bin\perl.exe "%s" %s)

I wanted to create another ISAPI so *.cgi would be treated as a Perl script.
I have
1) open IIS
2) Expand ComputerName->Web Sites, selected properties
3) Under Home Directory tab, select Configuration
4) Click Add button
5) simulating the setting for *.pl, I have entered:
5.1) Executable= C:\Perl\bin\perl.exe "%s" %s
5.2) Extension= .cgi
5.3) Limit to GET,HEAD,POST
5.4) Script engine= ticked
5.5) check that file exists=ticked
HOWEVER- the OK button is disabled.

I tried repeat 3-4, for the following, but no joy
a) ComputerName->Web Sites->ComputerName,
b) the Virtual Directory containing *.pl files

why won't it let me create new ISAPI filter? I am logged on as a
workstation administrator!