In the Projects window, right-click on a project and choose Properties from the context menu. In the Category pane, select Application Descriptor, and click the Content Handler tab. Pressing Add or Edit opens the Content Handler Properties window.
In the Class field, choose a class name from the dropdown menu.
ID is an identification string that can be used to invoke a content handler and control access.
In Content types, list the content types for which this content handler is responsible. Use Add Type and Remove to manage the list.
In Suffixes, provide a list of URL suffixes that act as a substitute for an explicit content type.
In Access allowed to, list IDs for content handlers that are allowed access to this content handler. If the list is empty, access to this content handler is granted to every content handler.