Unpackaged x64 C++ WinUI application fails with "Access is denied"

[torleifat]

Describe the bug

I created a new WinUI project and converted it to unpackaged using this guide. I made no other modifications and attempted to start it which resulted in the following messages:

\dev\WindowsAppRuntime_BootstrapDLL\MddBootstrap.cpp(373)\Microsoft.WindowsAppRuntime.Bootstrap.dll!00007FFBF53880CF: (caller: 00007FFBF53871DB) Exception(1) tid(429c) 80070005 Access is denied. Msg:[Error in LoadLibrary: 5 (0x5) loading C:\Program Files\WindowsApps\Microsoft.WindowsAppRuntime.1.2_2000.707.2303.0_x64__8wekyb3d8bbwe\Microsoft.WindowsAppRuntime.dll] CallContext:[\Initialize] Exception thrown at 0x00007FFC1E76CD29 in MiraQ.exe: Microsoft C++ exception: wil::ResultException at memory location 0x0000001C186FCB80. Exception thrown at 0x00007FFC1E76CD29 in MiraQ.exe: Microsoft C++ exception: [rethrow] at memory location 0x0000000000000000. \dev\WindowsAppRuntime_BootstrapDLL\MddBootstrap.cpp(213)\Microsoft.WindowsAppRuntime.Bootstrap.dll!00007FFBF539BB71: (caller: 00007FFBF5386E09) ReturnHr(1) tid(429c) 80070005 Access is denied. Msg:[\dev\WindowsAppRuntime_BootstrapDLL\MddBootstrap.cpp(373)\Microsoft.WindowsAppRuntime.Bootstrap.dll!00007FFBF53880CF: (caller: 00007FFBF53871DB) Exception(1) tid(429c) 80070005 Access is denied. Msg:[Error in LoadLibrary: 5 (0x5) loading C:\Program Files\WindowsApps\Microsoft.WindowsAppRuntime.1.2_2000.707.2303.0_x64__8wekyb3d8bbwe\Microsoft.WindowsAppRuntime.dll] CallContext:[\Initialize] ] CallContext:[\Initialize] \dev\WindowsAppRuntime_BootstrapDLL\MddBootstrap.cpp(166)\Microsoft.WindowsAppRuntime.Bootstrap.dll!00007FFBF5386EF7: (caller: 00007FF63C20B72C) ReturnHr(2) tid(429c) 80070005 Access is denied. CallContext:[\Initialize]

WinAppSDK nuget version: 1.2.221209.1 WinAppSDK runtime: 1.2.221209.1

This does work if I build and run it as x86.

I tried to reinstall the runtimes in case I had an old version laying around that was causing trouble. This is the 1.2X appruntime I have installed now:

Microsoft.WindowsAppRuntime.1.2_2000.707.2303.0_x64__8wekyb3d8bbwe Microsoft.WindowsAppRuntime.1.2_2000.707.2303.0_x86__8wekyb3d8bbwe MicrosoftCorporationII.WinAppRuntime.Main.1.2_2000.707.2303.0_x64__8wekyb3d8bbwe MicrosoftCorporationII.WinAppRuntime.Singleton_2000.707.2303.0_x64__8wekyb3d8bbwe Microsoft.WinAppRuntime.DDLM.2000.707.2303.0-x6_2000.707.2303.0_x64__8wekyb3d8bbwe Microsoft.WinAppRuntime.DDLM.2000.707.2303.0-x8_2000.707.2303.0_x86__8wekyb3d8bbwe

Steps to reproduce the bug

1. Create a new Blank App, Packaged.
2. Convert it to Unpackaged using this guide.
3. Attempt to debug it in x64

Expected behavior

I would expect there to be not be any Access is Denied message.

Screenshots

No response

NuGet package version

Windows App SDK 1.2.2: 1.2.221209.1

Packaging type

Unpackaged

Windows version

Windows 10 version 21H2 (19044, November 2021 Update)

IDE

Visual Studio 2022

Additional context

No response