Where can I get the Windows Workflow "wca.exe" application? | I am walking through the MS Press Windows Workflow Step-by-Step book and in chapter 8 it mentions a tool with the filename "wca.exe". This is supposed to be able to generate workflow communication helper classes based on an interface you provide it. I can't find that file. I thought it would be in the latest .NET 3.5 SDK, but I just downloaded and fully installed, and it's not there. Also, some MSDN forum posts had links posted that just go to 404s. So, where can I find wca.exe?