[Problem/Bug]: Migrating to WebView2ConmpositionControl results in Could not load file or assembly 'Microsoft.Windows.SDK.NET, Version=10.0.17763.10

[mtinnes]

What happened?

We are attempting to migrate to the WebView2 composition control from the standard WebVew2 control and are getting the following runtime error:

System.IO.FileNotFoundException: 'Could not load file or assembly 'Microsoft.Windows.SDK.NET, Version=10.0.17763.10, Culture=neutral, PublicKeyToken=31bf3856ad364e35'. The system cannot find the file specified.'

This is from simply replacing occurrences of WebView2 with WebView2CompositionControl in both the XAML and Code. It seems the composition control has some specific dependency which we are not satisfying, however I am not sure how to resolve it.

Our project property groups looks like this:

	<PropertyGroup>
		<OutputType>WinExe</OutputType>
		<TargetFramework>net8.0-windows</TargetFramework>
		<Nullable>enable</Nullable>
		<UseWindowsForms>True</UseWindowsForms>
		<UseWPF>true</UseWPF>
		<EnableDefaultApplicationDefinition>false</EnableDefaultApplicationDefinition>
		<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
		<RootNamespace>XXX</RootNamespace>
		<AssemblyName>XXX</AssemblyName>
		<ApplicationIcon>Resources\favicon.ico</ApplicationIcon>
		<Description>XXXX</Description>
		<PackageProjectUrl>XXXX</PackageProjectUrl>
		<Platforms>AnyCPU;x64</Platforms>
		<ApplicationManifest>app.manifest</ApplicationManifest>
		<UseRidGraph>true</UseRidGraph>
		<!--<SupportedOSPlatformVersion>10.0.26100.0</SupportedOSPlatformVersion>-->
	</PropertyGroup>

Importance

Important. My app's user experience is significantly compromised.

Runtime Channel

Stable release (WebView2 Runtime), Prerelease (Edge Canary/Dev/Beta)

Runtime Version

No response

SDK Version

1.0.3405.78

Framework

WPF

Operating System

Windows 11

OS Version

26100.4946

Repro steps

Replace occurrences of WebView2 to WebView2CompositionControl in XAML and Code behind.

Repros in Edge Browser

No, issue does not reproduce in the corresponding Edge version

Regression

No, this never worked

Last working version (if regression)

No response

[MarcelloPoletti]

Same problem in my projects [.Net 9, WebView2 1.0.3405.78]
marc.

[hojjatjafary]

Update your Target OS to 10 or higher.

[MarcelloPoletti]

Thank's hojjatjafary!