According to one embodiment, in response to an inquiry received from a first application for an extension service associated with a first of a plurality of extension points of an operating system, a list of one or more extensions is identified that have been registered for the first extension point with the operating system, where the first application is executed within a first sandboxed environment. The identified list of extensions is displayed to prompt a user to select one of the extensions to be associated with the first application. In response to a selection of one of the extensions, the selected extension is launched in a second sandboxed environment. The selected extension and the second application were packaged in an application bundle, and when the application bundle was installed, the selected extension and the second application appeared in a registry of the operating system as separate applications.