Extensions (in Package) (Windows 10)

Defines one or more extensibility points for the package.

Element hierarchy





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Attributes and elements



Child elements

Child element Description
Extension (in type: CT_PackageExtensions) Declares an extensibility point for the package.

Parent elements

Parent element Description
Package Defines the root element of an app package manifest. The manifest describes the structure and capabilities of the software to the system.

The following elements have the same name as this one, but different content or attributes:


Extensibility points are a mechanism by which an app can add functionality in a manner defined by the operating system. An example of a package extensibility point is the ability to specify a dynamic-link library or executable that contains activatable classes that your code uses.


The following example is taken from the package manifest of one of the SDK samples.

    <Extension Category="windows.activatableClass.proxyStub">
      <ProxyStub ClassId="332fd2f1-1c69-4c91-949e-4bb67a85bdc5">
        <Interface Name="IToaster" InterfaceId="6a112353-4f87-4460-a908-2944e92686f3" />
        <Interface Name="IToast" InterfaceId="699b1394-3ceb-4a14-ae23-efec518b088b" />
        <Interface Name="IAppliance" InterfaceId="332fd2f1-1c69-4c91-949e-4bb67a85bdc5" />
    <Extension Category="windows.activatableClass.inProcessServer">
        <ActivatableClass ActivatableClassId="Microsoft.Samples.DllServerAuthoring.Toaster" ThreadingModel="both" />

See also


Item Value
Namespace http://schemas.microsoft.com/appx/manifest/foundation/windows10