Can't building the C# SSO DLL with Error: pvk2pfx command not found.

Visual Studio 2015 Community, Windows Driver Kit 10, Windows 10. I follow this doc http://pubs.vmware.com/vsphere-60/index.jsp#com.vmware.wssdk.dsg.doc/sdk_c_sharp_development.5.4.html?path=7_1_0_0_2_2_0#1002265

I navigate to the .NET subdirectory for SSO client samples.

cd %WS_SDK_HOME%\ssoclient\dotnet\cs\samples

and then generate a test certificate and STSService stubs using the build.bat script.

.\build.bat

I get this error:

'Files' is not recognized as an internal or external command,

operable program or batch file.

Error: pvk2pfx command not found.

       Please ensure that you have added path to pvk2pfx.exe to the PATH variable

I do file search, and pvk2pfx.exe doesn't not exist on a computer. MSDN says pvk2pfx.exe is included in WDK, but it's probably outdated info and after WDK installation, I still can't find pvk2pfx.exe

How to build the dll with VS2015?