Wamp 3 Upgrade - PHP Extensions Directory (no replies)

I recently installed the latest version of WAMP (3.06, 64 bit). I followed the upgrade instructions.

I am having a problem with the PHP extensions directory. PHPInfo() says that I'm using c:/php/ext
whereas my php.ini file says: extension_dir ="m:/wamp/bin/php/php7.0.10/ext/"

It looks like it tries to load the php.ini from c:\windows, but that is not present, so according to phpinfo it uses the proper one:

Configuration File (php.ini) Path C:\WINDOWS
Loaded Configuration File M:\wamp\bin\apache\apache2.4.23\bin\php.ini

As it uses the wrong extensions directory, my extensions don't load.

I'm confused - as I don't see c:/php/ext used anywhere. I've tried restarting all the services.

I'm using Windows 8.1, PHP 7.0.10, Apache 2.4.23, MySQL 5.7.14. Wamp is working fine otherwise.