Mente sq nok der var noget med de %s'r
Windows NT and IIS 4
To install PHP3 on an NT Server running IIS 4, follow these instructions:
In Internet Service Manager (MMC), select the Web site or the starting point directory of an application.
Open the directory's property sheets (by right clicking and selecting properties), and then click the Home Directory, Virtual Directory, or Directory tab.
Click the Configuration button, and then click the App Mappings tab.
Click Add, and in the Executable box, type: 'c:\path-to-php-dir\php.exe %s %s'. You MUST have the %s %s on the end, PHP will not function properly if you fail to do this.
In the Extension box, type the file name extension you want associated with php scripts. (You must repeat step 5 and 6 for each extension you want associated with php scripts. (.php3 and .phtml are common)
Set up the appropriate security. Make sure the directories that have php script files have 'Script' permission. (This is done in Internet Service Manager), and if your NT Server uses NTFS file system, add execute rights for I_USR_ to the directory that contains 'php.exe'.
http://www.umesd.k12.or.us/php/win32install.html#pws