Description:
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I read in install.txt that I could put a path for my php.ini file in HKEY_LOCAL_MACHINE\SOFTWARE\PHP\IniFilePath. This applies to PHP 5 only as I understand it.

I tried that, but PHP 5 kept accessing the php.ini in c:\winodws. It took me a while to figure out, and I had to download Filemon (www.systeminternals.com) to figure it out. It turns out that, under IIS 6 at least, whatever you put in HKEY_LOCAL_MACHINE\SOFTWARE\PHP\IniFilePath is actually appended to the web server executable root directory, and does not stand on its own (as the documentation implies). In my case, IIS looked for the ini file at C:\windows\system32\inetsrv\"C:\Program Files/php-5.0.4-Win32"\php.ini which is not valid.

I reconfigured the variable to be ../../../Program Files/php-5.0.4-Win32, and things worked. Note the exclusion of quotes is important.

Reproduce code:
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Here is the context from install.txt;

Copy your chosen
   ini-file to a directory that PHP is able to find and rename it to
   php.ini. PHP searches for php.ini in the following locations (in
   order):

     * PHPIniDir directive (Apache 2 module only)
     * HKEY_LOCAL_MACHINE\SOFTWARE\PHP\IniFilePath
     * The PHPRC environment variable
     * Directory of PHP (for CLI), or the web server's directory (for
       SAPI modules)
     * Windows directory (C:\windows or C:\winnt)

Expected result:
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For IIS to read C:\Program Files/php-5.0.4-Win32 for my php.ini when "C:\Program Files/php-5.0.4-Win32" is in the registry.

Actual result:
--------------
IIS read the invalid path C:\windows\system32\inetsrv\"C:\Program Files/php-5.0.4-Win32"\php.ini instead.