Can't Get Php_sqlsrv Extension To Load Correctly

I'm using Windows XP Home, Apache 2.2 as web server, and PHP 5.2.5.

I have php installed in c:php. I have the extensions directory set to c:phpext.

Enabling a different extension, like php_zip works.

If I leave the entry in php.ini for php_sqlsrv.dll, then I get a message that is can't be loaded.

If I try to run php at the command line using php -v, then it pops up a dialg box:
Title: php.exe - unable tolocate component
Message: The application has failed to start because php5.dll was not found.
Then another pop up dialog saying that php_sqlsrv.dll could not be loaded.

If I turn on PHP error messages to be displayed in the browser, and stop and restart Apache then I see:
PHP startup: unable to load dynamic link library ./php_sqlsrv.dll - the specified module could not be loaded.


Here's the line in my Apache config file:
LoadModule php5_module c:/php/php5apache2_2.dll

There is no plain php5.dll in the c:php directory.

Perhaps this extension ONLY works with IIS as the web server?

Happens also on XP Pro wih IIS.