... Installing PHP for PWS/IIS 3 , PWS 4 or newer and IIS 4 or newer versions. ... Double click on the new string value and enter the path to php.exe in the value data field. ex: c:\php\php.exe . ... Highlight the new key and in the right side pane, double click the "default value" and enter phpfile . ... Right click on the phpfile key and select New->Key , name it Shell . ... Highlight the new key command and in the right side pane, double click the "default value" and enter the path to php.exe . ...