Unable to load DLL 'Microsoft.ui.xaml.dll' or one of its dependencies: Access is denied

Question

Unable to load DLL 'Microsoft.ui.xaml.dll' or one of its dependencies: Access is denied

Peterjc 91

I am trying to get a WinUI3 app to run unpackaged.

I have addded the
<WindowsPackageType>None</WindowsPackageType><UseWinUI>true</UseWinUI>
into the project file, and also have

   <ItemGroup>  
       <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.1.5"/>              
       <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.22621.755" />  
       <Manifest Include="$(ApplicationManifest)" />  
     </ItemGroup>

I can build this, and run it on my Win11 dev machine, however when tryin to test in a Window10 VM, it does not run, and I see the following in the Event Viewer

   Description: The process was terminated due to an unhandled exception.  
   Exception Info: System.DllNotFoundException: Unable to load DLL 'Microsoft.ui.xaml.dll' or one of its dependencies: Access is denied. (0x80070005 (E_ACCESSDENIED))  
      at MyApp.Program.XamlCheckProcessRequirements()  
      at MyApp.Program.Main(String[] args)

I have installed

.net 6 runtime
Windows App SDK runtime
VC runtime

It looks similar to the discussion here (https://github.com/microsoft/WindowsAppSDK/issues/974) except mine error does have the
Access is denied
at the end.

I have tried everything in the above link , and nothing fixes this.

I am not sure where
Microsoft.ui.xaml.dll'`` is (it is not included in my built files); I do not know where to go to next.

   Does anyone have any ideas on how the diagnose this?  
     
   Thanks in advance

Antonio Ávila 5 Reputation points

2023-07-08T01:28:04.1233333+00:00
In my case I just realized that I was using a project on Github, and that project didn't have the launchSettings.json file uploaded. This file is part of the basic Maui project template.

I just created a Properties folder, and then a file called "launchSettings.json" with the following content:

{ "profiles": { "Windows Machine": { "commandName": "MsixPackage", "nativeDebugging": false } } }

1 answer

Your answer

Antonio Ávila 5 Reputation points

2023-07-08T01:28:04.1233333+00:00

In my case I just realized that I was using a project on Github, and that project didn't have the launchSettings.json file uploaded. This file is part of the basic Maui project template.

I just created a Properties folder, and then a file called "launchSettings.json" with the following content:

{ "profiles": { "Windows Machine": { "commandName": "MsixPackage", "nativeDebugging": false } } }

Answer 1

Castorix31 90,686

Did you try in the project file :

<WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>

(Microsoft.ui.xaml.dll is in C:\Program Files\WindowsApps\ + Microsoft.WindowsAppRuntime version directory)

Peterjc 91 Reputation points

2022-11-10T07:37:09.297+00:00

Hi thanks for that.

I was hoping to not have to include everything in the app itself (which I think WindowsAppSDKSelfContained would do?)

Interesting, even on my dev machine, I cannot get into C:\Program Files\WindowsApps (I have no permissions). Is this normal?
Peterjc 91 Reputation points

2022-11-10T07:49:02.06+00:00

I have set permissions of
C:\Program Files\WindowsApps\Microsoft.WindowsAppRuntime.1.1_1005.616.1651.0_x64__8wekyb3d8bbwe
(the only x64 folder in there) to ALL for all users, but I still get the same access denied error
Castorix31 90,686 Reputation points

2022-11-10T09:02:05.86+00:00

There are some issues on GitHub and I have also this problem if I compile in x64 (adding WindowsAppSDKSelfContained is the only workaround I found)
In x86 it works fine for me (tested on Windows 10 21H1, Windows App SDK 1.1.0)
Peterjc 91 Reputation points

2022-11-11T00:24:13.827+00:00

Ok, I see, yes I found https://github.com/microsoft/WindowsAppSDK/issues/2443

I have added my case to it as well. I suppose for now I will try the WindowsAppSDKSelfContained
Peterjc 91 Reputation points

2022-11-11T02:42:03.017+00:00
I noticed WinApp 1.2 was now available, so I tried updating to this. I also installed the 1.2 version of the WinApp redsit on the test VM

Now the app would load, however, as I want to check that the webview2 is also installed (which my app will use), I call

string version = CoreWebView2Environment.GetAvailableBrowserVersionString();

But this resulted in

Message:System.TypeInitializationException: The type initializer for 'WinRT.ActivationFactory1' threw an exception. ---> System.UnauthorizedAccessException: Access is denied. (0x80070005 (E_ACCESSDENIED)) at WinRT.BaseActivationFactory..ctor(String typeNamespace, String typeFullName) at WinRT.ActivationFactory1..ctor()
at WinRT.ActivationFactory1..cctor() --- End of inner exception stack trace --- at WinRT.ActivationFactory1.As(Guid iid)
at Microsoft.Web.WebView2.Core.CoreWebView2Environment.Make___objRef_global__Microsoft_Web_WebView2_Core_ICoreWebView2EnvironmentStatics()
at Microsoft.Web.WebView2.Core.CoreWebView2Environment.get__objRef_global__Microsoft_Web_WebView2_Core_ICoreWebView2EnvironmentStatics()
at Microsoft.Web.WebView2.Core.CoreWebView2Environment.GetAvailableBrowserVersionString()
at MyApp.MainWindow.CheckWebview2Installed()

So once again a E_ACCESSDENIED error.

I then added the
<WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained>
into the project file, and the app now runs.

So there seems to be something with using a shared WinApp library
Castorix31 90,686 Reputation points

2022-11-11T18:50:29.223+00:00

I want to check that the webview2 is also installed

As workaround, maybe you can use the method 1 from Detect if a suitable WebView2 Runtime is already installed
Peterjc 91 Reputation points

2022-11-14T01:41:43.547+00:00

Thanks for the suggestion, however, I was more worried if the above failed, then other calls will as well,

For now I will go with WindowsAppSDKSelfContained, and hopefully a fix will come around
Shanti Sharma 0 Reputation points

2023-01-27T11:52:06.2766667+00:00
The basic test application with .Net7.0 core and VS 17.4.4 wasn't running at all after upgrade , so i downgraded VS to previous version 17.4.0, which started App to run in debug mode atleast but it was unable to run if I click on executable directly , it was throwing following error on application log

Application: XXXX.exe CoreCLR Version: 7.0.22.51805 .NET Version: 7.0.0 Description: The process was terminated due to an unhandled exception. Exception Info: System.DllNotFoundException: Unable to load DLL 'Microsoft.ui.xaml.dll' or one of its dependencies: The specified module could not be found. (0x8007007E) at XXXX.WinUI.Program.XamlCheckProcessRequirements() at XXXX.WinUI.Program.Main(String[] args)in projdir\obj\x64\Debug\net7.0-windows10.0.19041.0\win10-x64\Platforms\Windows\App.g.i.cs:line 28

Then I tried to set <WindowsAppSDKSelfContained>true</WindowsAppSDKSelfContained> in the csproj file

and then it started throwing following error :It looks like the webpage at https://0.0.0.0/ might be having issues, or it may have moved permanently to a new web address.

so any idea why is it so?
Reza245 0 Reputation points

2023-05-11T19:19:03.1733333+00:00

worked for me, thanks

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Unable to load DLL 'Microsoft.ui.xaml.dll' or one of its dependencies: Access is denied

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