I did this
as explained here but it was for IIS 6 http://rebolforum.com/index.cgi?f=printtopic&topicnumber=39&archiveflag=new
I also activated 32 bits for application pool as explained here http://blogs.iis.net/wadeh/archive/2009/04/13/running-perl-on-iis-7.aspx
But when browsing to the test script it doesn't work, seems to take forever showing nothing, then in the end shows this message error:
502 - Web server received an invalid response while acting as a gateway or proxy server.
There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.
I used a dedicated server on windows 2008
Source code of the test script:
REBOL [Title: "Cgi Test in Rebol"]
print "HTTP/1.0 200 OK^/Content-type:text/html^/^/";
print []
print ["Date/time is:" now]
print []
Should I ask on serverfault rather as nobody seems to know here ?