Sharepoint under the hood supports both handlers and old style webservices if you really need these you can add the support into your site byt simply unblocking the file extensions. If you havn’t unblocked the extensions you will get the following error ‘The file you are attempting to save or retrieve has been blocked from this Web site by the server administrators.’
To unblock file types do the following
* Open ‘Sharepoint 2010 Central Adminstration’
* Click ‘Managed Web Application’
* Highlight the web application that needs the support
* Click ‘Blocked File Types’ on the ribbon
At the top of the list you will see the 2 file types simply delete them and click ok
You will now be able to use handlers and web services.