Just for everyone's information, the problem was that the PHP Informix driver (php_ifx.dll) was dependent on Informix Client SDK (one particular dll named isqlt09a.dll) which was a 64 bit DLL as 64 bit client SDK for Informix was installed on the machine and that was getting picked up resulting in the error below. Installing the correct 32 bit Informix client SDK solved this particular error message. Thanks, Don. -----Original Message----- From: Chris [mailto:cjaveni@xxxxxxxxxxxxxxxx] Sent: Tuesday, February 23, 2010 9:49 AM To: php-windows@xxxxxxxxxxxxx Subject: Unable to load dynamic library php_ifx %1 Hello, and thanks for your assistance in advance. I am using PHP 4.4.9 on Windows 2008 64 bit with informix and am reciving the following error: PHP Warning: Unknown(): Unable to load dynamic library 'D:\php\extensions\php_ifx.dll' - %1 is not a valid Win32 application in unknown on line 0. On another server, I have the same setup but using the Sqlserver dll. Any Suggestions? Thanks, Chris -- PHP Windows Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Windows Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php