[5.0.100-preview.6.20308.7] NuGetPackageExplorer PlatformNotSupportedException at launch

[DotNetAppCompatFeiWang]

Application Name: NuGetPackageExplorer
OS: Windows 10 RS5
CPU: X64
.NET Build Number: 5.0.100-preview.6.20308.7

App Source on GitHub link: https://github.com/NuGetPackageExplorer/NuGetPackageExplorer
Library : https://github.com/novotnyllc/OSVersionHelper (.NET Standard 2.0)

Verify Scenarios:
1). Windows 10 RS5 X64 + .NET Core SDK build 5.0.100-preview.6.20308.7: Fail
2). Windows 10 RS5 X64 + .NET Core SDK build 5.0.100-preview.5.20279.10: Pass

Findings :
Exception comes from OSVersionHelper library(.NET Standard 2.0) that NugetPackageExplorer uses.

Repro Code :

static void Main(string[] args)
 {
            if (Windows.Foundation.Metadata.ApiInformation.IsApiContractPresent("Windows.ApplicationModel.Calls.CallsVoipContract", 1))
            {
                System.Console.WriteLine("Windows.ApplicationModel.Calls.CallsVoipContract v1.x found");
            }
            else
            {
                System.Console.WriteLine("Windows.ApplicationModel.Calls.CallsVoipContract v1.x NOT found");
            }
 }

On Prev6, returns :

Unhandled exception. System.PlatformNotSupportedException: Operation is not supported on this platform. (0x80131539)

Exception Log :
Application: NuGetPackageExplorer.exe
CoreCLR Version: 5.0.20.30506
.NET Version: 5.0.0-preview.6.20305.6
Description: The process was terminated due to an unhandled exception.

Exception Info: System.TypeInitializationException: The type initializer for 'PackageExplorer.PluginManager' threw an exception.
 ---> System.TypeInitializationException: The type initializer for 'OSVersionHelper.WindowsVersionHelper' threw an exception.
 ---> System.PlatformNotSupportedException: Operation is not supported on this platform. (0x80131539)
   at OSVersionHelper.WindowsVersionHelper.IsApiContractPresent(UInt16 majorVersion)
   at OSVersionHelper.WindowsVersionHelper..cctor() in D:\a\1\s\OSVersionHelper\WindowsVersionHelper.cs:line 27
   --- End of inner exception stack trace ---
   at OSVersionHelper.WindowsVersionHelper.get_HasPackageIdentity() in D:\a\1\s\OSVersionHelper\WindowsVersionHelper.cs:line 125
   at PackageExplorer.PluginManager.GetPluginDirectory() in C:\Users\Appcompat\Downloads\NuGetPackageExplorer-master\NuGetPackageExplorer-master\PackageExplorer\MefServices\PluginManager.cs:line 50
   at PackageExplorer.PluginManager..cctor() in C:\Users\Appcompat\Downloads\NuGetPackageExplorer-master\NuGetPackageExplorer-master\PackageExplorer\MefServices\PluginManager.cs:line 43
   --- End of inner exception stack trace ---
   at PackageExplorer.PluginManager.EnsurePluginCatalog(AggregateCatalog mainCatalog) in C:\Users\Appcompat\Downloads\NuGetPackageExplorer-master\NuGetPackageExplorer-master\PackageExplorer\MefServices\PluginManager.cs:line 218
   at PackageExplorer.PluginManager..ctor(AggregateCatalog catalog) in C:\Users\Appcompat\Downloads\NuGetPackageExplorer-master\NuGetPackageExplorer-master\PackageExplorer\MefServices\PluginManager.cs:line 100
   at PackageExplorer.App.get_Container() in C:\Users\Appcompat\Downloads\NuGetPackageExplorer-master\NuGetPackageExplorer-master\PackageExplorer\App.xaml.cs:line 53
   at PackageExplorer.App.Application_Startup(Object sender, StartupEventArgs e) in C:\Users\Appcompat\Downloads\NuGetPackageExplorer-master\NuGetPackageExplorer-master\PackageExplorer\App.xaml.cs:line 65
   at System.Threading.Tasks.Task.<>c.<ThrowAsync>b__139_0(Object state)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run()
   at PackageExplorer.App.Main()

Related DevDiv bug: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1138457

cc @dotnet-actwx-bot

[Dotnet-GitSync-Bot]

I couldn't figure out the best area label to add to this issue. Please help me learn by adding exactly one area label.

[danmoseley]

BTW thank you @DotNetAppCompatFeiWang for your thorough and complete issues.

cc @AaronRobinsonMSFT

[AaronRobinsonMSFT]

This is by design. See #37672