this is not a mod. it is the phpBB integrated avatar field. To upload from the local machine and/or a remote site you must have recent version of PHP and write permissions on your server. You must also enable avatar usage, upload, etc in your administration panel.
Forget last post i finaly found the option i just got a responce in PHPBB hacks hehe. I found it, but now all i need is an Avatar Pack =) and then where the heck are MODs, and all them missing groups in admin panel =P