uap3:AppExtensionHost

Article
10/30/2023

Declares an app extensibility point of type windows.appExtensionHost. This element indicates which categories of extensions the app can host.

Element hierarchy

<uap3:Extension>

<uap3:AppExtensionHost>

Syntax

<uap3:AppExtensionHost>

  <!-- Child elements -->
  uap3:Name

</uap3:AppExtensionHost>

Attributes and elements

Attributes

None.

Child elements

Child element	Description
uap3:Name	Specifies a category of extensions that the app can host.

Parent elements

Parent element	Description
uap3:Extension	Declares an extensibility point for the app.

Remarks

For a packaged app to see/enumerate appextensions it must meet at least one of the following criteria:

Run as MediumIL (or higher)
Run in an AppContainer and declare a matching appextensionhost
Run in an AppContainer and have the packageQuery capability

This check is called by AppExtensionCatalog.Open and AppExtensionCatalog::RequestRemovePackageAsync.

Examples

The following example indicates that the app can host the Office spell check and browser extensions.

<Package
    xmlns:uap3="http://schemas.microsoft.com/appx/manifest/uap/windows10/3"  
    IgnorableNamespaces="... uap3">
    <Applications>
        <Application>
            <Extensions>
                <uap3:Extension
                    Category="windows.appExtensionHost">  
                    <uap3:AppExtensionHost>  
                        <uap3:Name>com.microsoft.office.spellcheck.ext</uap3:Name>
                        <uap3:Name>com.microsoft.office.browser.ext</uap3:Name>  
                    </uap3:AppExtensionHost>  
                </uap3:Extension>
            </Extensions>
        </Application>
    </Applications>
</Package>

Requirements

Item	Value
Namespace	`http://schemas.microsoft.com/appx/manifest/uap/windows10/3`
Minimum OS Version	Windows 10 version 1607 (Build 14393)

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