Description:
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While installing (with the installer) in CGI Mode (Windows 2003 SP1, IIS6), I get an error message at the end of the installation (There is a problem with this Windows Installer Package)

Reproduce code:
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Event Viewer shows this:

Product: PHP 5.2.0 -- Error 1721. There is a problem with this Windows Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor. Action: iisextVBS, location: C:\Program Files\PHP\, command: "C:\WINDOWS\system32\iisext.vbs" /AddFile "C:\Program Files\PHP\php-cgi.exe" 


I found this again as Bug #26185, for PHP 4.2.1, but obviously it reared its ugly head again (#26185 is closed, but the behavior persists).

Expected result:
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Installation not producing any error messages, and registering PHP in "Web Service Extensions"

Actually this is probably a problem with the fact iisext.vbs requires more parameters in Windows 2003. So instead of
"C:\WINDOWS\system32\iisext.vbs" /AddFile "C:\Program Files\PHP\php-cgi.exe",
you should type
"C:\WINDOWS\system32\iisext.vbs" /AddFile "C:\Program Files\PHP\php-cgi.exe" 1 PHP 1 "PHP: Hypertext Processor"

Use iisext.vbs /? to see the meaning of the parameters.

The installer needs to be fixed.

Actual result:
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Installation produced the error message, PHP was not registered, but all other things seemed to go well.