CustomCapability: LoadPackagedLibrary() can not load RpcClient.dll

[huntercao]

CustomCapability: LoadPackagedLibrary will cause exception.
Build with VS2017 + Windows SDK 17134.

The exception details are below:

System.DllNotFoundException
  HResult=0x80131524
  Message=Unable to load DLL 'api-ms-win-core-libraryloader-l2-1.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
  Source=CustomCapability
  StackTrace:
   at SDKTemplate.ServiceViewModel.LoadPackagedLibrary(String filename, UInt32 reserved)
   at SDKTemplate.ServiceViewModel.<>c.<.ctor>b__58_0() in C:\windows_samples\win10_audio\uwp\CustomCapability\cs\ServiceViewModel.cs:line 90
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.get_Value()
   at SDKTemplate.ServiceViewModel.<>c__DisplayClass59_0.<StartMetering>b__0() in C:\windows_samples\win10_audio\uwp\CustomCapability\cs\ServiceViewModel.cs:line 212
   at System.Threading.Tasks.Task.Execute()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at SDKTemplate.ServiceViewModel.<StartMetering>d__59.MoveNext() in C:\windows_samples\win10_audio\uwp\CustomCapability\cs\ServiceViewModel.cs:line 203
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at SDKTemplate.MeteringData.<button_Click_StartMetering>d__2.MoveNext() in C:\windows_samples\win10_audio\uwp\CustomCapability\cs\Scenario1_MeteringData.xaml.cs:line 24

When we modify the dll name to api-ms-win-core-libraryloader-l2-1-0.dll, the LoadPackagedLibrary() will always return 0 while the RpcClient.dll is in the working folder.
As introduced in this page: https://docs.microsoft.com/en-us/uwp/win32-and-com/win32-apis

API	Requirements
LoadPackagedLibrary	Introduced into api-ms-win-core-libraryloader-l2-1-0.dll in 10.0.10240.

[oldnewthing]

Duh. I messed up the API set, and I forgot to say CharSet.Unicode. Fix coming.

[oldnewthing]

Fixed in v6.0.5.