Not able to load the extensions

Apache 2.2
PHP 5.2.6 (as a module)
Windows

Relevant parts of php.ini
; Directory in which the loadable extensions (modules) reside.
extension_dir = I:\php\ext

extension=I:\php\ext\php_mssql.dll
extension=I:\php\ext\php_mysql.dll

Note: I did try it with just the name ("php_mysql.dll") but it doesn't seem to work either way

And httpd.conf:

LoadModule php5_module I:\php\php5apache2_2.dll
AddType application/x-httpd-php .php
PHPIniDir C:\WINDOWS
.

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