SQLSRV30.EXE is not a valid Win32 application

15 Oct 2012 If you want to install the PDO drivers for PHP 5.4, you will need to extract SQLSRV30.EXE with Winrar.

Since I was using EasyPHP, I needed to extract the files into the following directory (there's also another php directory in EasyPHP, not sure why, but it's worth adding the files under "ext" there too): C:\Program Files\EasyPHP-12.1\php\php546x120827090829\ext

You will also need to add the following lines to your PHP.ini file under PHPExt:

extension=php_pdo_sqlsrv_54_ts.dll
extension=php_sqlsrv_54_ts.dll