No references were found in the windows sdk (Windows 1903)

On updating to the May 2019 release of Windows 10 the directory C:\WINDOWS\SysWOW64\WinMetadata is removed and this is where Visual Studio is 2017 and 2019 is looking for all of the files.

There is 2 way to solve this:

1. Click Browse in reference manager and chose your reference from C:\WINDOWS\System32\WinMetadata.

2. Copy WinMetadata folder from C:\WINDOWS\System32\WinMetadata to C:\WINDOWS\SysWOW64\WinMetadata. and then re-open reference manager.

Looks like the parent bug is documented at https://developercommunity.visualstudio.com/content/problem/446490/visual-studio-cant-see-winmetadatadirectory-in-cwi.html

For me I clicked browse and used this path %windir%\Sysnative\WinMetadata and it worked for me. Windows 10 1903 \ VS 17